Technical data

Address areas for the
peripherals and their
programming
With STEP 5 operations, you can access the peripherals either directly
or via the process image. Remember that the process image only
exists for input and output bytes of the P peripherals with byte
addresses from 0 to 127.
Note
Using the interface modules IM 304, IM 307 and IM 308, you can
access distributed address areas using your program. This allows
access to two new address areas similar to the O area. In contrast
to the O area, however, access to these areas is only possible
using absolute addressing or using FB 196 of the "basic
functions" software package (refer to Catalog ST59).
Area
(absolute address)
Address Parameters
with
P peripherals with process image
L IB / T IB 0 to 127
L IW / T IW 0 to 126
L ID / T ID 0 to 124
A I/ AN I / O I / ON I 0.0 to 127.7
S I / R I / = I
L QB / T QB 0 to 127
L QW / T QW 0 to 126
L QD / T QD 0 to 124
A Q / AN Q / O Q / ON Q 0.0 to 127.7
S Q / R Q / = Q
When the operation is processed, only the
process image is changed. The new status of the
process image is only output to the
peripherals at the end of the cycle.
P peripherals
L PY / T PY 0 to 127
L PW / T PW 0 to 126
T PY / T PY 128 to 255
T PW / T PW 128 to 254
The inputs and outputs are addressed
directly byte or word oriented.
Q peripherals
L OY / T OY 0 to 255
L OW / T OW 0 to 254
The inputs and outputs are addressed
directly byte or word oriented.
PII
(process input
image)
PIQ
(process output
image)
Digital peripherals
inputs/
outputs
Digital or analog
peripherals
inputs/outputs
EF00
EFFF
EF80
EF7F
F000
F07F
F080
F0FF
F100
F1FF
Extended
peripherals
inputs/outputs
Address Distribution in the CPU 928B
CPU 928B Programming Guide
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