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3--4
Understanding the Features
PLC Registers
The OP400 panels communicate to the PLC through user defined PLC data
registers. The starting or “Base” register is assigned during panel configuration and
automatically occupies four consecutive 16-bit data registers. In this manual the
registers are identified as M+0, M+1, M+2, and M+3. Force control register M+3 is
used to force a setpoint to a specified value. The term PLC register is used for the
area of memory within the PLC used for data exchange with the OP--406. PLC
registers (addresses) are sometimes known as data registers, internal registers or
16-bit (word) addresses.
The OP--406 uses a bank of 4 contiguous PLC registers. The register set is shown in
the table below.
Function
M+0
M+1
M+2
Register
M+3
PLC
Register
OP--406 Panel PLC Register Map
Indicator lamps and pushbutton LEDs on/off control
Indicator lamps and pushbutton LEDs flash control
Pushbutton on/off status
Force pushbutton data and commands
L6
B1
B2
B3
Register Bit Association
LSB
12
13
14
15
8
9
10
11
4
5
6
7
0
1
2
3
MSB
M+1
M+0
M+3
M+2
L4 L3
L5
L1
L2
B4
L1
L4 L3
L5
L2
L6
B1
B2
B3
B4
B1
B2
B3
F2
F1
B4
F3
B1
B2
B3
B4
Indicator Lamp/LED Pushbutton On/Off Contol
Indicator Lamp/LED Pushbutton Flash Control
Pushbutton On/Off Status
Force Data and Commands
If the OP406 panel is configured for force capability (using the Force Option), the
PLC can directly control button status when desired. This may be useful for
initialization purposes.
PLC Register
Overview
PLC Register Map
Force Commands
