Addressing S5-100U
6.6.2 Accessing the Interrupt PIQ
When accessing the interrupt PIQ, the following rules apply.
• Data can be written to the interrupt PIQ only within time-controlled or interrupt-driven program
processing.
• Data from a time-controlled or interrupt-driven program to external outputs is written during time-
controlled or interrupt-driven program processing both to the “normal” PIQ and the interrupt
PIQ.
• Data from the interrupt PIQ is read out to the outputs in the next interrupt output data cycle.
• The PIQ is copied to the interrupt PIQ after the OB1 program cycle.
Note
The interrupt output data cycle is executed only after the interrupt PIQ has been written
to.
Access to the interrupt PIQ is expressed by the “PB” or “PW” operand identifiers in a statement in
the time-controlled or interrrupt-driven program.
The letter “T” identifies the “Transfer” operation (see chapter 8).
Figure 6-11. Accesses to the Interrupt PIQ
• Byte-by-byte writing
“PB <byte address>”
Example: Writing signal states to all
channels of an 8-channel digital output
module in slot 13
• Word-by-word writing
“PW <word address>”
Example: Writing an analog value to channel 3
of a 4-channel analog output module in slot 5
Interrupt PIQ
Byte 13
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Byte 110
Byte 111
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
015
T PB/PY* 13
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
High byte
ACCU 1
Low byte
T PW 110
015
High byte
ACCU 1
Low byte
* depending on the programmer you have
6-14
EWA 4NEB 812 6120-02
To Next Page
Loading...
