User`s guide

Page 54

Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)

5.4.2. Table [2]: Actuator Operational Status

Words [4

 63] PLC access: Read Only.

This data is primarily derived from holding register [6] in the actuator. It is retrieved with the “standard

data request” - Modbus read command when the particular actuator is being polled (scanned).

However, bit-14 is adjusted by the 1746-C.

This status word can be “bit parsed” to give:

• Bit-0: LSO is tripped (valve is at the end of its OPEN travel limits)

• Bit-1: LSC is tripped (valve is at the end of its CLOSE travel limits)

• Bit-2: Valve is moving in the OPENING direction

• Bit-3: Valve is moving in the CLOSING direction

• Bit-4: Selector Switch is in the Local position

• Bit-5: Selector Switch is in the Remote position

• Bit-6: Open Torque ALARM is active.

• Bit-7: Close Torque ALARM is active.

• Bit-8: Valve Stall Alarm is active (valve not moving on command)

• Bit-9: Power Monitor Alarm is active (loss of control voltage alarm)

• Bit-10: Motor Overload Alarm is active

• Bit-11: Phase Monitor Alarm is active (only if Phase Sentry is Installed)

• Bit-12: Local (Hardwired) Alarm is active.

• Bit-13: Fail Alarm Self-diagnostics Alarm is active.

• Bit-14: Comm Alarm … Valve not communicating with the network

(Same as the value “3” in Table [1])

• Bit-15: Unit Alarm … Set when any actuator alarm is set.

Note: Bit-0 is the LSB in the word. Bit-15 is the MSB in the word.

Some of these bit indications are repeats of those in table [12]. However, not all.