14 • OPACITY MONITOR MANUAL IM-A-08740-05 •
4.0 Miscellaneous
4.1 Retransmission of Process Variable
Refer to the overall wiring diagrams (Figures 6-9). The terminals for the retransmission of the process variable
are located on the printed circuit board. They are marked “4-20 ma.”
4.2 Modbus Communications
Refer to the overall wiring diagrams (Figures 6-9). Terminals for Modbus communication are located on the
lower left of the printed circuit board. They are marked “RS-485 +, -, SHD.” These terminals provide information
with Modbus protocol using RS-485.
The Modbus address assignments are shown in Figure 14.
4.3 Troubleshooting (Diagnostic LED’s)
4.31 Diagnostic LED’s
LED’s are provided for onboard diagnostic of the I/O (Input/Output). The Relay Status and “Processor
Running” LED’s are identied in Figure 1.
The “Processor Running” LED indicates the state of the microprocessor by blinking at different rates as
shown in Figure 15.
4.32 Checksum Error
When the microprocessor values do not match the values stored in memory, “Checksum Error” is displayed.
All logic functions stop. To correct the Checksum Error, turn the power off and then back on. If this procedure
doesn’t rectify the error, reenter all control parameters. If the problem persists, contact the sales ofce where you
purchased the unit.
To Next Page
Loading...
Need help?
General