Siemens SIMATIC S5-100U, System Manual

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S5-100U Addressing
6.5.2 Accessing the Process Image Output Table (PIQ)
During a program cycle, data coming from the control program to the output modules is written into
the process image output table (PIQ). The data is transferred to the output modules in the following
data cycle.
Access to the PIQ is expressed by the operand identifiers “Q”, “QB”, or “QW” in a statement in
the control program.
The letter “T” identifies the “Transfer” operation (see Chapter 8). The “=” character assigns the
result of a logic operation (RLO) to the operand that follows the character (see chapter 8).
Figure 6-9. Accesses to the PIQ
• Bit-by-bit writing
“Q <bit address>”
Example: Writing the signal state to
channel
6 of an 8-channel digital output
module in slot 4
= Q 4.6
• Byte-by-byte writing
“QB <byte address>”
Example: Writing the signal states to all
channels of an 8-channel digital output
module in slot 29
• Word-by-word writing
“QW <word address>”
Example: Writing an analog value to
channel 2 of a 4-channel analog output
module in slot 6
Bit number
PIQ
Byte 116
Byte 117
7 6 5 4 3 2 1 0
Byte 4
a a a a
a a a a
a a a a
a a a a
Byte 29
a a a a a
a a a a a
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0 15
T QB 29
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High byte
ACCU 1
Low byte
T QW 116
0 15
High byte
ACCU 1
Low byte
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EWA 4NEB 812 6120-02b
6-11