User`s guide

Page 58

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

5.4.4. Table [4]: Valve Position Indication … 0 – 100.0%

Words [4

 63] PLC access: Read Only.

The Network Master receives the valve position from the actuator as an integer representing 0

 100%

open in 0.1% increments. In other words, it receives a value from 0 – 1000 and each increment

indicates a 0.1%

• 0  Full Closed ( 0.0% open)

• 1000  Full Open (100.0 % open)

This data is derived from holding register [13] in the actuator. It is retrieved with the “standard data

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

Example Table [4] Feedback (48-node network) …

Characteristics:

• Units [1, 3, 4] indicated position is 0% open … probably not operating.

• Unit [2] indicated position is 70.6% open

• The rest of the network’s indicated position is fully open at 100.0% open

Last Node

on 48 Node

Network

First Node

on Network