Limitorque
®
Master Station IV EEP-SN4001 FCD LMENIM5010-00-AQ – 03/19
62
9.3 Blank Display
A blank display is usually the result of an activated screen saver. If screen saver setting adjustments are needed, refer to
section 7. Also, lack of power will also cause a blank screen – check for green PWR LED and/or measure power input
terminals for proper power supply voltage. If the PWR LED is not green and power is supplied to the input terminals,
check the removable fuse for continuity.
Figure 9.1 – Rear Panel On/Off Switch, Fuse, and Power Input Terminals
9.4 Network Communications
Problem: Unable to establish communications with DCS serial port.
1. Confirm null modem cable connection
2. Verify DCS address setting
3. Verify baud rate and parity settings.
4. Check host system settings
5. Test communication cable(s)
Problem: Unable to establish communications with DCS Modbus TCP/IP port
1. Confirm IP address settings (a ping command from some point on the network can confirm the MSIV’s
IP settings and connectivity).
2. Verify ethernet path from host to the MSIV
3. Verify that the hosts’ communication settings are compatible with Modbus TCP/IP. The MSIV
complies with the Modbus TCP/IP messaging implementation guide V1.0b published by the Modbus
Organization.
Problem: Unable to establish communications with field MOVs.
1. Confirm proper cable connections on the first MOV in the loop and the MSIV. RS-485 is polarity
sensitive.
2. Confirm RS-485 baud rate, parity, and stop bits settings match the MOV’s settings.
3. Confirm the MSIV is configured for Modbus RTU mode.
4. Confirm the timing settings (timeout, prop delay).
5. Confirm that the MOV field unit is activated (number turned green in “Active MOVs” screen).
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