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S5-115F Manual
5.3.2
Accessing the PIQ
New signal states are entered in the PIQ during program scanning. At the end of each program
scan, the PIQs are exchanged between the two subunits, compared, and transferred to the output
modules only if they are identical.
Writing bit by bit
for binary operations:
Writing byte by byte
for transfer from ACCUM 1:
ACCUM 1
Writing word by word
for transfer from ACCUM 1:
ACCUM 1
EWA 4NEB 811 6148-02
=Q 4.6
T QB 36
15
High byte
Low byte
T QW 52
15
High byte
Low byte
Figure 5-7.
PIQ
7 6 5 4 3 2 1 0
0
0
Accessing the PIQ
Addressing
Bit No.
Byte 4
Byte 36
Byte 52
Byte 53
5-7
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