Model 880A-N4X Model 880S-N4X PLC Graphic Control System Operator’s Installation and Instruction Manual DETCON, Inc. 3200 Research Forest Dr., A-1 The Woodlands, Texas 77381 Ph.281.367.4100 / Fax 281.298.2868 www.detcon.com September 11, 2009 • Document # 3290 • Revision 1.
880-N4X Page intentionally blank 880-N4X Instruction Manual ii
880-N4X Table of Contents Introduction .............................................................................................................................................1 1.0 1.1 Analog Systems (4-20mA sensors) ...................................................................................................... 1 1.2 Serial Systems (RS-485) ...................................................................................................................... 1 2.0 System Configuration ..........
880-N4X Table of Figures Figure 1 DA4 4-20mA Configuration .................................................................................................................. 1 Figure 2 RS-485 Network Configuration ............................................................................................................. 2 Figure 3 Back of Touch Panel Display................................................................................................................. 3 Figure 4 Basic PLC ..............
880-N4X 1.0 Introduction The standard Detcon Model 880 is a PLC based graphic control system specifically designed to serve as a host monitoring and control system for networks of gas detection sensors as well as a wide range of other field devices. The main unit is programmed as a Modbus master and is available in two versions: Serial (Model 880S-N4X) and Analog (Model 880A-N4X).
880-N4X network, or Modbus™ (Figure 2). RS-485 serial communication is used for multipoint communications and is a popular choice due to ease of wiring installation. Advantages of using RS-485 serial communication: ¾ ¾ ¾ ¾ ¾ Inexpensive method allowing multiple devices to communicate over a single twisted pair of wires. More data/information can be sent beyond the simple 4-20mA signal. Transceiver communication up to 4,000 feet without using repeaters.
880-N4X 2.0 System Configuration The Model 880 is designed to monitor and display the status of field sensor devices, provide programmable alarm outputs, and log alarm incidents via a USB drive. The system is equipped with a color graphic touch screen display. Control electronics are industry standard PLC modules pre-selected to fit the application. Three programmable “Banks” of Alarms are designed to give the user the ability to set up three “Zones” of Alarm 1, Alarm 2, Alarm 3 and Fault conditions.
80-N4X The touch panel acts as a master interface to the internally located PLC. As such, the touch panel polls the PLC, which, in turn, polls the field devices for information. A wand is used on the screen to operate system controls and/or move to additional screens. A USB port (Figure 3) is located on the back of the display at the bottom. When a USB Drive (USB Memory Stick) is installed, the display will automatically log to the drive when any alarms and/or faults have been recorded by the PLC.
880-N4X A Figure 5 Isolated Network Adapter RELAY OUT RELAY DATA COM CPU Direct L LOGIC 205 PWR BATT RUN CPU RUN TERM STOP DATA COM 4 5 6 7 0 1 2 3 D2-08TR D2-DCM D2-DCM N Input Details 100-240VAC 3.5A Maximum Power Factor Corrected Frequency : 50/60Hz 5-240VAC 1A 50/60Hz Made in China C + C L 45JB 5 US C US R ALM V.ADJ 2 Output Details Continuous Loading 24VDC/10A H 6 3 +V DC ON +V -V -V + 4 1 C NOT Used 0 L G 7 5-30VDC 5mA-1A 24V . . . .
880-N4X Power Input 100-240VAC 50~60Hz 18-30VDC Power Consumption Base Unit <40W – Not to include I/O Modules and sensors Total Power is dependent on number of I/O modules, number of sensors, and the type of sensors attached. Total power of unit with I/O modules and gas sensors not to exceed 200 Watts. Display 8” inch diagonal Graphic Backlit LCD Touch screen display Electrical Classification NEMA 4 Enclosure Dimensions 18''W x 20''H x 8.
880-N4X 3.0 Installation The Detcon Model 880 PLC is a wall-mount enclosure, and can be mounted anywhere that is rated safe for NEMA 4X enclosures. The enclosure is equipped with wall-mounting flanges for easy wall mount installations. Care should be given to prevent sharp objects from colliding with the touch screen display as damage to the display may cause the unit to become inoperative. The screen can be cleaned with a mild detergent and a lint free cloth. Never use an abrasive cleaner on the display.
880-N4X TB3-J1 COMM M S D M S D M S D L S D L S D L S D RELAY RELAY RELAY TB3-J2 COMM COMM M S D M S D L S D L S D 4-20mA INPUT 4-20mA INPUT -SBA RS-485 Cable to Output Terminal Blocks. COMM + COMM Add Additional Modules as needed. Maximum of 12 Modules. + - S B A RS-485 and Power Cable Figure 8 installing Din-Rail mounted modules I/O Module Addressing I/O modules must be properly addressed to establish correct communications. All Modules are addressed in Hexadecimal.
880-N4X WARNING: The use of the 880’s 24VDC to power unit mounted Din-Rail modules is be restricted to no more than 4Amps (§96 Watts). Care should be taken to insure that the total current of devices utilizing this power does not exceed this rating, as this may cause detrimental damage to the unit and will void the warranty. Sensor 4 RS-485 to 880 Sensor 3 COMM Typical Sensors M S D L S D 4-20mA INPUT Sensor 1 Sensor 2 Figure 10 Typical Analog Sensor Wiring Serial Connections 2.
880-N4X FAULT A ALARM 3 RS-485 from 880 A COMM M S D L S D A RELAY ALARM 2 ALARM 1 A Figure 12 Typical RL-4 Module 4. Terminal blocks are provided for connection to other external devices such as a remote display, a printer, or other device capable of communication with the 880. The Remote display should be connected to the “REMOTE OUTPUT” terminal blocks, and other devices should be connected to the “RS-422 SLAVE” terminal blocks.
880-N4X 6. Connect 110-220VAC input to the Circuit Breakers labeled “VAC (L1)” and labeled “NEU (L2)”. Connect external ground to the Green/Yellow terminal labeled “GROUND” (Figure 14). The power supply is able to accept AC input voltages from 100 to 240VAC at 50 or 60Hz. General Wiring Notes: When I/O Modules are located at a remote distance from the controller, an end-of-line terminating resistor is required to enhance communications reliability.
880-N4X 24VDC Adjust +V DC ON +V -V -V Output Details Continuous Loading 24VDC/10A H ALM V.ADJ R US C C US 45JB Made in China Input Details 100-240VAC 3.5A Maximum Power Factor Corrected Frequency : 50/60Hz L N Figure 16 24VDC adjustment 3.4 Auxiliary 24VDC Input If an Auxiliary 24VDC Input is to be connected to the unit, the voltage may need to be adjusted to insure proper operation.
880-N4X 13.85" 10" 6.8" Ø0.344" 14.75" 15.75" www.detcon.com Mounting Flange Figure 17 Dimensional Overview 2. Run the serial cable between the Main 880 enclosure and the 880 Remote Display enclosures. TXD+ TXDRXD+ RXD0V 3. Connect the RS-422 Serial communications cable to the terminal blocks labeled “REMOTE OUTPUT” in the Main 880 enclosure (Figure 18). REMOTE OUTPUT Figure 18 Main 880 terminal blocks and connections 4.
TXD+ TXDRXD+ RXD0V 880-N4X TERMINAL INPUT Figure 19 Remote RS-422 connections REMOTE OUTPUT TERMINAL INPUT 0V RXDRXD+ TXDTXD+ MAIN 880 TXD+ TXDRXD+ RXD0V TXD+ TXDRXD+ RXD0V CUSTOMER SUPPLIED WIRING REMOTE DISPLAY Figure 20 Remote Interconnect Wiring 5. Connect 110-220VAC input to the Fuse Block labeled “VAC (L1)” in the lower left of the enclosure. Connect Neutral (or L2) to terminal labeled “NEU (L2)” and Ground to the Green/Yellow terminal labeled “GROUND” (Figure 21).
880-N4X 4.0 Setup The 880 incorporates a Touch Screen Graphic Display Panel. A Stylus ‘Wand’ is provided for use with the touch screen display. Care should be given to prevent sharp objects from colliding with the touch screen display as damage to the display may cause the unit to become inoperative. The screen can be cleaned with a mild detergent and a lint free cloth. Never use an abrasive cleaner on the display. 4.
880-N4X The display screen also contains a number of “buttons”. These “buttons” act as toggle switches that change state when activated by the wand. These buttons will indicate the change in state by some obvious means such as a change in color, name, or both (i.e., when changing the state of an alarm from ascending to descending the button will change from a blue button displaying “ASC” to a gray button displaying “DES”). 4.
880-N4X Figure 26 Screen Settings From the “Setting” Screen, select the “Adjust Clock” button to adjust the clock (Figure 27) or the “Adjust Display” button to adjust the Display Screen (Figure 28). Figure 27 Clock Adjust Screen To adjust the Time and Date use the arrow keys. Once the correct time and date have been set, select “OK” to close the screen. Select “Main Menu” to exit the “Setting” screen, and select “Exit” to exit the Setup screens. To adjust the display use the arrow keys.
880-N4X 4.3 880 Setup 1) From the “Main Screen” (Figure 29), enter the “System Configuration Screen” by touching the “System Configuration” box with the wand. Figure 29 Main Screen 2) The display will prompt for a password to enter the 880 “System Configuration Screen”. The default password is “1234”. Enter the password in the Pop-Up Screen and press enter to continue. This will open the “System Configuration Screen” (Figure 30 – Analog, Figure 31 - Serial).
880-N4X NOTE: The System Configuration Screens differ only slightly between the Analog and Serial units. Figure 31 Serial Configuration Screen 3) Use the wand to select the “FACILITY NAME” box. A keyboard will appear to allow input of the facility name (Figure 32). The facility name can be any alphanumeric string of no more than 40 characters. After the facility name has been entered, use the ‘ENTER’ key to transfer the string to the “System Configuration Screen”.
880-N4X Figure 33 Inputting the number of channels 5) Select the “# OF RELAYS BANK 1”, “2”, and/or “3” Box and input the number of RL4 Modules that will be attached to the unit for each “BANK” of alarms. (Maximum of 6 RL4 Modules per “BANK”). This will configure the unit for those relay Modules. NOTE: Pre-selected addresses are set in the firmware of the 880 for the alarm “Banks”. These addresses are directly related to the RL4 module addresses and the RL4 relays used for annunciators.
880-N4X 7) Each channel must be set up with the correct parameters for each sensor. Use the wand to select a channel from the “Main Screen”, this will open that channels corresponding “Channel X Details Screen” (Figure 34). Figure 34 Channel Detail Screen 8) The Model 880 is set up for RS-485 Modbus™ communication. All communications with the sensors are accomplished through the RS-485 communications Protocols.
880-N4X Continue this sequence for the third and fourth gas channels. Channel 5 would be connected to the second DA4, addressed at 02hex.
880-N4X button will cause the associated Alarm to activate when the sensor value falls below the value set for that Alarm (Descending). Set Alarm’s 1, 2, and 3 to either ascending or descending. b) When activated (blue), the ‘LAT’ button will cause the associated Alarm to be “Latching” and will not allow that Alarm to reset until the cause is cleared or removed and the Alarm is reset with the reset button.
880-N4X b) Select “Gas Type”, and input the gas type of the sensor. (i.e., H2S, LEL, CO2, etc.) Up to 10 characters maximum. The “Gas Type” entered here must match the “Gas Type” entered at the Main 880. c) The Range of the sensor is transferred by the Main 880 and should not be changed in the Remote Display. However, the decimal point must be set for the range to be displayed correctly.
880-N4X 5.0 System Operation The touch screen display serves as the graphic user interface to the system. Maneuvering through the system screens and accessing data fields is accomplished by touching the wand to the appropriate area, box, button, or key on the screen. The provided “wand” should be the only instrument used to activate the screen as other instruments may cause damage to the screen.
880-N4X Each channel is displayed as a separate line item on the main screen. Each channel also has an associated “Channel Detail Screen”. To open a channels detail screen touch the appropriate channel with the wand, this will open the associated channels detail screen (Section 5.3). Figure 35 The Main Screen A row of boxes is located at the bottom of the screen. The second box displays the time and date.
880-N4X ‘CAL’ fault will not clear until the sensor returns to normal operation and, if set to non-latching and ascending, Alarm 1 will not clear until the “Concentration” falls below the set “Alarm 1 Level.” Figure 36 Channel Details Screen 5.4 Alarm History Screen When alarms are initiated, the unit stores information about these alarms into memory. If a USB Drive is installed in the back of the display, this information is written onto the drive for permanent storage (USB Drive sold separately).
880-N4X changed from Alarm History to Alarm Count, with a detail button that allows viewing more information on each event recorded. 880-N4X Instruction Manual Rev. 1.
880-N4X 6.0 Trouble-shooting 6.1 Sensor Faults The unit is set up such that Sensor faults will set Fault alarms associated with that sensor. If a sensor goes into a fault condition, that channel will flag a fault. From the “Main Screen” each channel can be quickly viewed to see which channel is causing the fault. That sensor should be then checked to find the cause of the fault. Faults are logged in the Alarm History for aid in tracing intermittent sensor problems.
880-N4X Slave ID 01 ID 02 ID 03 ID 04 ID 05 ID 06 ID 07 ID 08 ID 09 ID 0A ID 0B Results similar to those shown here should be expected. In this example slave device 03 and 0B would need to be changed. Master 425 425 425 425 425 425 425 425 425 425 425 MV 451 430 486 410 420 432 422 415 418 440 310 Difference 26 5 61 -15 -5 7 -3 10 -7 15 115 Measuring at the master device between dc common and A, or dc common and B should give a reading of around 2.5vdc.
880-N4X 7.0 Spare Parts Recommended spare parts list: Detcon Part # Description 995-321091 995-08TR00-000 995-323220-100 995-508803-500 360-DLP240-024 347-SSP000-00A 0300 CPU Replacement Battery PLC Relay Module, Communications Module Isolated Network Adapter Module 24VDC 240Watt Power supply Stylus ‘Wand’ for Touch Screen Display 3Amp 3AG Slo-Blo Fuse Include Detcon part number when ordering spare parts. The PLC CPU Module is programmed to match the 880 Unit (Analog or Serial).
880-N4X Appendix A RS-485 System Integration Wiring RS-485 is a generic electrical specification only. It does not specify connector types, protocols, or cable type. It is the responsibility of the installer to provide a correct physical installation for the RS-485 network to function properly. RS-485 is very inexpensive and inherently rugged, allowing multiple devices to communicate over a single twisted pair of wires.
880-N4X The characteristic impedance of the cable must be between 100 to 120 ohms. Twisted pair is used because if the cable does run near a noise source both conductors will pick up the same amount of noise; therefore, effectively canceling it out. Incorrect Wiring Schemes Among the biggest problems with an RS-485 bus is the use of incorrect wiring schemes mixed with improper or no line termination.
880-N4X Figure 40 Recommended RS-485 communications set-up Grounding Another problem that can occur with RS-485 is incorrect grounding. Neither one of the two conductors in the cable is ground. Both of the conductors are supplying a current to maintain a voltage level relative to an external reference. A third conductor must be supplied to establish a reference through earth ground. RS-485 is specified be able to work normally with a ±7V ground potential difference and survive ±25V surges.
880-N4X Figure 41 Unbalanced Data Bus The addition of 2 repeaters (Figure 42) can solve this problem. The repeaters look like short stubs to the main bus, and at the same time they create 2 new buses that have all the same characteristics as the main bus. Each leg must have termination resistors to balance the new data bus. Figure 42 Data Bus using two repeaters Be sure to check the equipment being installed.
880-N4X Device Hook-Up Installation should begin by deciding where devices will be located and how the connections between devices and the master will be established. The ideal scenario would look like Figure 44. The example shows the 880 Controller connected to 11 slave devices using a daisy-chain wiring scheme. This would require 2 different twisted pair cables, one pair for power, and the other for the RS-485 data bus.
880-N4X In this case it is impossible to balance the data bus because there is no distinct beginning or end to the cable run. The best way to make this type of installation successful is to install repeaters in a few key areas as shown in Figure 46. Repeaters are used to eliminate the t-taps or stubs, which can cause communication problems. The location and number of stubs will dictate where repeaters need to be installed. Four repeaters are installed to eliminate the stubs.
880-N4X Appendix B Hexadecimal Table ID# none 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 SW1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 SW2 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A 880-N4X Instruction Manual ID# 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 SW
880-N4X Appendix C Revision History Revision 0.0 1.0 Date 02/25/09 09/25/09 880-N4X Instruction Manual Changes made Original Release. Discrete relays removed, unit programmed to use RL-4 Modules instead. Rev. 1.
880-N4X Appendix D Drawings and Diagrams 1. 880-N4X Dimensional Overview 2. 880-N4X Component Layout 3. 880-N4X Wiring Diagram 880-N4X Instruction Manual Rev. 1.
880-N4X 880-N4X Instruction Manual Rev. 1.
880-N4X 880-N4X Instruction Manual Rev. 1.
880-N4X 880-N4X Instruction Manual Rev. 1.