User`s guide

Page 62

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

5.4.7. Table [8]: Analog Output #1

Words [4  63] PLC access: Read / Write

This table/command tells the actuator to place an appropriate 4-20 mA signal on its analog output

channel. This data is derived from holding register [10] in the actuators and is retrieved with the

“standard data request” - Modbus read command when the particular actuator is being polled

(scanned).

When the 1746-C sends a new value to the actuators, it uses the Modbus function 6 command to write

to holding register [10] in the actuators.

The output is a linear scaling based on:

• 0 (0x0000) = 4 mA

• 4095 (0x0FFF) = 20 mA

Note: Only values 0



4095 are allowed … all others are ignored.

A read back of Table [8] will

• If a write command issued: reflect the write command accepted by the 1746-C

• If a read command issued: reflect the current value of the analog output register in the

actuators.

Note: Please read the Operators Manual the particular actuator for more information.

Note: This is an option that must be installed on the actuator.