User`s guide

Page 69

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

5.4.11. Table [13]: Solid State Relay (SSR) Configuration Table

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

This is a read/write table that is used to help configure the actuators on the network. It is intended to

work with actuators that are setup for modulating control mode. If a 320A actuator has an

OPTIONAL

SSR installed the network master must ensure the actuator knows it is configured with an SSR.

By writing a non-zero

POSITIVE value to these positions in table [13], tells the network master to tell

the particular 320A actuator to configure itself to use an SSR … set coil [37] = 1 on the actuator. If not

a 320A actuator, this table value has no purpose.

SUMMARY:

• If word [n] == 0 (where “n” is 4  63) … this actuator does not have a SSR.

• If word [n] > 0 (any non-zero POSITIVE value) … this actuator has a SSR.

An example would be a network of actuators in which 3 are 320A systems that have SSCs … lets say

on valves 2, 4 and 10 by Modbus address. The corresponding words for these actuators are:

• Valve 2: Word [5] … ( 2 + 3)

• Valve 4: Word [7] … ( 4 + 3)

• Valve 10: Word [13] … (10 + 3)

A read back of Table [13] will verify the write command being accepted by the 1746-C.

Note: If an actuator

• has an SSR installed AND

• it is NOT configured for SSR control AND

• it is placed in modulating mode

then the remote host will be unable to control the valve via setpoint control. The actuator will read the

desired setpoint positions but will not be able to send the valve to the position and effectively stop it

there.

Note: Remember, setting this configuration bit is only necessary if the unit is a 320A system … 320B

and TEC2000 systems do not need this configuration assistance.