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The RTD Module Status LED
The module status LED indicators are used in order to indicate operating errors or module errors. You can not recover from the module errors. When an error is present, the RTD module no longer communicates to the processor. The channel states are disabled and the data words are cleared.The RTD Module LED Indicators
Illustration 18 g00563392
The "Module Status" LED is on. The "Channel Status" LED is flashing. Refer to Troubleshooting, "Resistance Temperature Detector".
Illustration 19 g00563417
The "Module Status" LED is off. Cycle the power and refer to Troubleshooting, "Resistance Temperature Detector".Modbus Module
The Modbus module allows an Allen-Bradley SLC 500 to interface with devices that are compatible with Modbus. The module allows a remote access to the MMS.Port Information for the Modbus Module
Illustration 20 g00563418
Information for port 1 is in the following list:
RS-485
1 stop bit and no parity
RTU slave
Baud Rate from the "Setup" Screen
Address from the "Setup" ScreenInformation for port 2 is in the following list:
RS-232
1 stop bit and no parity
RTU slave
Baud Rate from the "Setup" Screen
Address from the "Setup" ScreenJumper Settings for the Modbus Module
Illustration 21 g00563421
Troubleshooting the Modbus Module
Illustration 22 g00563423
Table 1
LED Name    Color    Status    Indication    
CFG     Green     Off     The normal state of the LED. No configuration related activity is occurring.