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Technical Instructions

Document No. 155-767

February 25, 2009

Modbus RTU Interface Module for SED2

Siemens Industry, Inc.

Description

The Modbus RTU Interface Module for SED2 enables serial communication

between a Modbus RTU and a SED2 Variable Frequency Drive (VFD).

Product Part Number

SED2-MODBUS2

Contents

• MicroGate II Interface module.

• Local cable for USS communication with SED2.

• Network cable for ModBus communication with Building Automation

controller.

• Installation documentation.

Required Tools

Personal computer for configuring device prior to operation.

Configuration Kit (SED2-MODBUS2_KIT), containing:

• External Power Supply for the MicroGate II.

• 9-pin (female) to 9-pin (female) Serial Null Modem Cable.

• Installation documentation.

NOTE: Both the Interface Module and the SED2 must be configured prior to

operation.

Figure 1.

Summary of content (12 pages)

PAGE 1
Technical Instructions Document No. 155-767 February 25, 2009 Modbus RTU Interface Module for SED2 Description The Modbus RTU Interface Module for SED2 enables serial communication between a Modbus RTU and a SED2 Variable Frequency Drive (VFD). Product Part Number SED2-MODBUS2 Contents Required Tools • MicroGate II Interface module. • Local cable for USS communication with SED2. • Network cable for ModBus communication with Building Automation controller. • Installation documentation.
PAGE 2
Technical Instructions Document Number 155-767 February 25, 2009 Modbus RTU Interface Module for SED2 Warning/Caution Notations Hardware Setup Power Supply WARNING: Personal injury/loss of life may occur if you do not perform a procedure as specified.
PAGE 3
Modbus RTU Interface Module for SED2 Technical Instructions Document Number 155-767 February 25, 2009 Hardware Setup, Continued The Interface Module is provided with two cables. A three wire cable (Figure 3) connects the NETWORK port to a network. Because the network connection type may vary among different installations, the cable ends are stripped wires to provide maximum flexibility. Figure 3. Three Wire Network Cable. Figure 4. RS485 Network Cable.
PAGE 4
Technical Instructions Document Number 155-767 February 25, 2009 Hardware Setup, Continued LED Indicators Modbus RTU Interface Module for SED2 There are a total of three bi-color LED indicators on the Interface Module. See Figure 8. The NET LED displays communications activity on the Network (Modbus) port. • The STAT LED displays the overall status of the Interface Module. • The LCL LED displays communications activity on the Local (SED2) port.
PAGE 5
Modbus RTU Interface Module for SED2 Hardware Setup Continued Technical Instructions Document Number 155-767 February 25, 2009 Parameter Protocol Default Configuration Table 4. Configuration Options.
PAGE 6
Technical Instructions Document Number 155-767 February 25, 2009 Changing the Configuration, Continued Modbus RTU Interface Module for SED2 Once the Interface Module is in CONFIGURATION Mode, it will send its current configuration to the terminal program. Figure 9. MicroGate II Configuration Display. Table 5. Keyboard Navigation. Use the UP and DOWN arrows, on the computer keyboard, to navigate to the field you want to change. Change values with the LEFT and RIGHT arrows.
PAGE 7
Modbus RTU Interface Module for SED2 SED2 Parameter Configuration Technical Instructions Document Number 155-767 February 25, 2009 The Interface Module communicates with the SED2 VFD using the USS protocol and the following parameter configuration: • USS address set to 0 • USS baud rate set to 19.2K • Parity set to Even • Number of data bits set to 8 Configure SED2 VFD parameters to communicate with the MicroGate II, per Table 3. Table 6.
PAGE 8
Technical Instructions Document Number 155-767 February 25, 2009 Watchdog Timer Setup Modbus RTU Interface Module for SED2 To enable an Interface Module Host Watchdog Function, the Interface Module Master controls the first two holding Registers, WDOG TIME (40001) and WDOG ACTION (40002). When the Host Watchdog Function activates, the Interface Module does not receive any further communications from the Master for a period of time determined by WDOG TIME (40001).
PAGE 9
Modbus RTU Interface Module for SED2 Verifying the Installation After all necessary connections have been made, power up the SED2 and the Interface Module. Wait approximately five seconds.
PAGE 10
Technical Instructions Document Number 155-767 February 25, 2009 Modbus RTU Interface Module for SED2 Interface Module The following tables contain the lists of all Interface Module holding Registers available Registers on the Interface Module. The Interface Module host may write to Registers 40001 through 40023. All other Registers are read only. There is a scaling factor included for some of the Registers.
PAGE 11
Modbus RTU Interface Module for SED2 Technical Instructions Document Number 155-767 February 25, 2009 Interface Module Registers, Continued Table 7. Interface Module Registers.
PAGE 12
Technical Instructions Document Number 155-767 February 25, 2009 Modbus RTU Interface Module for SED2 Interface Module Registers, Continued Table 8. Interface Module Registers.