Commonly Used Csc400 Modbus Registers - ACL CSC400 Installation And Operation Manual

Commonly Used CSC400 Modbus Registers

Notes:
- SCADAPack Register Addresses are listed for reference when programming SCADAPack PLC units.
- See the CSC400 Modbus Installation Manual for additional registers and specific details about reading and writing
registers.
Function Code 0x01 - Read Coils
Function used to read the state of each relay. Read Coil function code 0x01 can read all relay coils in two bytes.
Example PLC Coil
Register #
Address
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
Function Code 0x02 - Read Discrete Inputs
This Function is used to read the state of each input. 1 = ON, 0 = OFF (unless otherwise stated)
Example Input Modbus
PLC # Discrete
Register Input
Address Address
10001 1 0
10002 2 1
10003 3 2
10004 4 3
10005 5 4
10006 6 5
Modbus Coil Description
Address
0 "AUX1 Relay" control
relay
1 "AUX2 Relay" control
relay
2 IGN1 Pilot solenoid relay
3 IGN1 Main solenoid relay
4 Alarm relay
5 Not used
6 Proof of closure, IGN1
output relay
7 IGN1 Temperature Main
solenoid relay
8 IGN2 Pilot solenoid relay
9 IGN2 Main solenoid relay
10 IGN2 Temperature Main
solenoid relay
11 Proof of closure, IGN2
output relay
Inputs Input Bit
Byte
0 0 (LSB)
0 1
0 2
0 3
0 4
0 5
Type
Auxiliary
Control relay
Auxiliary
Control relay
Solenoid relay
Solenoid relay
Control relay
N/A
Control relay
Solenoid relay
Solenoid relay
Solenoid relay
Solenoid relay
Control relay
Description
Igniter 1 Alarm input
Igniter 1 Valve input
IGN1 Main solenoid
IGN1 Pilot solenoid
IGN1 T/Main solenoid
Reserved
Notes
Dry contacts,
max 0.12A @ 30VDC
1 = relay ON
Dry contacts,
max 0.12A @ 30VDC
1 = relay ON
1 = relay ON
1 = relay ON
0 = relay OFF = Alarm
condition. 1 = relay ON,
no Alarm
Reserved
1 = relay ON
1 = relay ON
1 = relay ON
1 = relay ON
1 = relay ON
1 = relay ON
Notes
1 = Alarm signal high
(Alarm indicated)
1 = Valve signal high
1 = Main solenoid is on
1 = Pilot solenoid is on
1 = T/Main solenoid is on
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