I/O modules • 147
Digital Outputs 750-511
Modular I/O System
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Parameterizing the registers:
The PLC can read and set the registers via the control and status byte and the
output bytes in the process image.
Control byte:
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Meaning
REG
W/R
0
0
0
0
A1
A0
Status byte:
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Meaning
REG
0
0
0
0
0
A1
A0
REG = 0 Process data exchange
REG = 1 Access to the registers
W/R = 0 Register read mode
W/R = 1 Register write mode
A1..A0
Register address
Register 2: B1=1, B0=0
Register 3: B1=1, B0=1
The output bytes of channel are used for the register values.
Examples for the pulse width bus module 750-511
The following examples illustrate the register read and write modes. The val-
ues are binary. In order to make things easier, only the process data of channel
1 is mentioned.
Register 2 read mode
The module is in process date exchange:
Control byte
Output byte 1
Output byte 0
0xxx xxxx
xxxx xxxx
xxxx xxxx
Status byte
Input byte 1
Input byte 0
0xxx xxxx
0000 0000
0000 0000
Register read access is available when bit 7 is set and the register address is
entered in the control byte.
Control byte
Output byte 1
Output byte 0
1000 0010
Xxxx xxxx
xxxx xxxxx