User`s guide

Page 76

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

5.4.14. Tables [16 & 17]: Monitor & Control Discrete Digital Outputs

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

The entire operation to monitor and control the discrete outputs requires 2 tables ...

• Table [16] ... CONTROL --- store commands (desired states) for discrete outputs (coils).

• Table [17] ... MONITORING --- feedback (actual states) of discrete outputs (coils).

Table [16] allows the operator the ability to monitor (poll) and control the discrete outputs on an

actuator. All discrete output control is performed via this table (no table [0] entries are required).

Table [17] is the feedback information for polling the discrete outputs.

• This data is retrieved with a separate Modbus read command when the particular actuator is

being polled (scanned).

• This data is only polled for when the matching valve entry in table [16] indicates that the 1746-C

should start monitoring these coils. Once polling (monitoring) has started, it must be explicitly

turned off.

• This table will only reflect the status of bits representing coils. All others are either ignored or

zeroed out.

• The PLC may reset this table with any value is prefers. All it needs to do is insert the new

value in the table and send it to the 1746-C as a write command. The table will be reset even

though nothing will be sent out to any actuator.

TEC2000 DISCRETE OUTPUTS (COILS)

On a TEC2000 system, there are 12 outputs and they are addressed as coils [1000 - 1011] in register

[1004] such that …

• Coil [1000] … RO1 … Relay Output # 1

• Coil [1001] … RO2 … Relay Output # 2

• Coil [1002] … RO3 … Relay Output # 3

• Coil [1003] … RO4 … Relay Output # 4

• Coil [1004] … RO9 … Relay Output # 9

• Coil [1005] … RO10 … Relay Output # 10.

• Coil [1006] … RO11 … Relay Output # 11

• Coil [1007] … RO12 … Relay Output # 12.

• Coil [1008] … SO6 … Solid State Output # 6

• Coil [1009] … SO7 … Solid State Output # 7

• Coil [1010] … SO8 … Solid State Output # 8

• Coil [1011] … RO9 … Relay Output # 9

Ordering is such that

• Coil [1000] is the LSB and located in the “bit-0” position … the right most position.

• Coil [1011] is the MSB and located in the “bit-11” position.