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 February 25, 2009 • Document # 3290 • Revision 0.
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 Figure 5 FA-ISOCON Module............................................................................................................................. 5 Figure 6 Unit overview......................................................................................................................................... 5 Figure 7 Dimensional Overview ..........................................................................................................................
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. Twelve 10Amp relays provide three “Banks” of four relays, each designed to give Alarm 1, Alarm 2, Alarm 3 and Fault conditions for each related bank.
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 where any alarms and/or faults have been recorded by the PLC.
880-N4X A Figure 5 Isolated Network Adapter The Isolated Network Adapter performs well in noisy environments where data corruption is possible due to induced noise. The Isolated Network Adapter can also be used to verify whether or not the unit is communicating and polling. To simplify troubleshooting, the Isolated Network Adapter has transmit and receive LED’s.
880-N4X Inputs RS-485 Modbus™ RTU Outputs User Configurable Relays: Three Banks of 4 relays per Bank (Fault, Alarm 1, Alarm 2, and Alarm 3) – 12 relays Relay maximum continuous operating current: 10A Maximum inrush current 30A (300ms) Primary: RS-485 Slave: RS-485 Remote Output: RS-422 Power Input 100-240VAC 50~60Hz 18-30VDC Power Consumption Base Unit <120W Total Power is dependent on number of I/O modules, number of sensors, and the type of sensors attached.
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 four (4) wall-mounting brackets 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.
+ A B 880-N4X RS-485 VDC Primary Out Figure 8 Typical RS-485 connections Analog Connections 3. For Analog Units (880A), communication is accomplished by using Detcon DA4 modules and the RS485 Modbus™. The 4-20mA sensors are directly connected to the DA4 modules, while the DA4 modules are connected via the RS-485 Modbus™ to the 880 PLC (Figure 9). All DA4’s are externally mounted and require an external power source. The correct setup of the DA4’s is covered in Section 4.3 880 Setup.
880-N4X A1+ A224 V 11 11 14 14 12 12 A2 (-) 11-NC 11-NC 11-NC 11-NC 14-NO 14-NO 14-NO 14-NO 12-COM 12-COM 12-COM 12-COM FLT ALM1 ALM2 ALM3 BANK 1 11-NC 11-NC 11-NC 11-NC 14-NO 14-NO 14-NO 14-NO 12-COM 12-COM 12-COM 12-COM FLT ALM1 ALM2 ALM3 BANK 2 11-NC 11-NC 11-NC 11-NC 14-NO 14-NO 14-NO 14-NO 12-COM 12-COM 12-COM 12-COM ALM1 ALM2 ALM3 BANK 3 FLT 11 11 NC - Normally Closed 14 14 NO - Normally Open 12 12 COM - Common A1 (+) Figure 10 Alarm Relay Connections 5.
880-N4X 3.1 Initial Power Checks Upon completion of all field wiring, apply power to the 880 by: 1) setting both the AC Circuit Breakers and DC Circuit Breakers to “ON”, 2) pushing the “POWER ON/OFF” switch on the front panel. The “POWER” LED should illuminate. If all connections have been made properly, the “FAULT” and “ALARM” LED’s should not be illuminated. The unit will go through a brief initialization and display the “Main Screen” (Figure 26, Section 4.3).
880-N4X colliding with the touch screen. The screen can be cleaned with a mild detergent and a lint free cloth. Never use an abrasive cleaner on the display. 1. Securely mount the 880 Enclosure in accordance with Figure 14. 13.85" 11" 6.8" Ø0.344" 15.2" 15.75" www.detcon.com Mounting Hardware Figure 14 Dimensional Overview 2. Run the serial cable between the Main 880 enclosure and the 880 Remote Display enclosures. TXD+ TXDRXD+ RXD0V 3.
TXD+ TXDRXD+ RXD0V 880-N4X TERMINAL INPUT Figure 16 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 17 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 18).
880-N4X 4.0 Setup 4.1 User interface When an alphanumeric or text string is called for, the unit will display an alphanumeric keyboard for the user to input information (Figure 19). Information typed by the user will be displayed in the box just above the keyboard. The keyboard is fully functional allowing the user to input spaces, special characters (i.e. ‘*’, ‘&’, etc.), and make changes between lowercase characters and capitals by using the CAP key.
880-N4X 4.2 Clock and Screen Adjustments Adjustments to the clock and screen are made entering the display’s Setup Screens. Only the Clock and Screen adjustments are discussed here. Changing other aspects of the Touch Panel may cause the unit to operate improperly and should not be attempted. Access the display’s System Setup Screens by touching the upper left corner of the touch panel with the wand and holding it there for 3-5 seconds. A warning box will appear (Figure 21).
880-N4X Figure 23 Screen Settings From the “Setting” Screen, select the “Adjust Clock” button to adjust the clock (Figure 24) or the “Adjust Display” button to adjust the Display Screen (Figure 25). Figure 24 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 26), enter the “System Configuration Screen” by touching the “System Configuration” box with the wand. Figure 26 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 27 – Analog, Figure 28 - Serial).
880-N4X Figure 28 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 29). 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 30 Inputting the number of channels 5) Select the “EXIT” box to exit the “System Configuration Screen” and return to the “Main Screen”. 6) Each channel must be set up with the correct parameters for each sensor. Using the wand to select a channel from the “Main Screen” will open that channels corresponding “Channel X Details Screen” (Figure 31). Figure 31 Channel Detail Screen 7) The Model 880 is set up for RS-485 Modbus™ communication.
880-N4X Serial Sensor Addressing (880S) a) The 880S is set up for RS-485 communication with Serial Sensors. All sensor addresses must start at 01hex and increment sequentially. Serial Sensors should be addressed (in hex) to match the channel number (in decimal) that they are assigned to. I.E., channel number 1 should be addressed as 01hex, and likewise channel number 10 should be addressed as 0Ahex.
880-N4X entry of 100 with a “Decimal Place” of 1 provides a range of 10.0, 10ppm or 10%. Likewise, a “Range” entry of 500 with a “Decimal Place” of 2 provides a range of 5.00, 5ppm or 5%.) 11) Select “Fault” to set the Fault as latching or non-latching. When de-activated (gray), the ‘N-L’ button will cause the Fault to reset itself only when the fault condition is cleared or fixed.
880-N4X 3) Use the wand to select the “FACILITY NAME” box. A keyboard will appear to allow input of the facility name (Figure 29). The facility name can be any alphanumeric string of no more than 40 characters, and should be the same as the Facility Name entered in the Main 880. After the facility name has been entered, use the ‘ENTER’ key to transfer the string to the “System Configuration Screen”.
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. 5.
880-N4X will open the associated channels detail screen (Section 5.3). Figure 32 The Main Screen A row of boxes is located at the bottom of the screen. The second box displays the time and date. The “AC” box is green when the unit is running on applied AC or if applicable the Auxiliary 24VDC Input. “USB Out” displays the status of the USB port on the back of the display. When a USB Drive is not installed, the button will be gray and display “USB Out”.
880-N4X Figure 33 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). The information can also be viewed on the “Alarm History Screen” by using the wand to select the “Alarm History” button on the Main Screen.
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 995-321297-000 995-323220-100 995-508803-500 360-DLP240-024 347-SSP000-00A 330-296762-000 0300 CPU Replacement Battery PLC Relay Module, Communications Module Isolated Network Adapter Module 24VDC 240Watt Power supply Stylus for Touch Screen Display 24VDC SPST Din-Rail Mounted Relay 3Amp 3AG Slo-Blo Fuse Include Detcon part number when ordering spare parts. 8.0 Warranty All warranties are FOB the Detcon factory.
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 37 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 38 Unbalanced Data Bus The addition of 2 repeaters (Figure 39) 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 39 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 41. 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 43. 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 Drawings and Diagrams 1. 880-N4X Dimensional Overview 2. 880-N4X Component Layout 3. 880-N4X Wiring Diagram 880-N4X Instruction Manual Rev. 0.
880-N4X Page intentionally blank Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381 Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067 Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • www.detcon.com • sales@detcon.com 880-N4X Instruction Manual Rev. 0.
