Addressing S5-115F Manual
5.3.3 Direct Access
Analog values are read in direct or transferred to the output module by calling the ANEI or ANAU
function blocks. AII safety functions are performed in these FBs.
You can also exchange information with digital modules direct. This is necessary when signal
states have to be processed in the control program immediately. Figure 5-8 shows the differences
when loading signal states.
FB
250
ANEI
T IB x
T IW x
PII
Byte Addresses of Input Modules
0 to 127 128 to 255
FB
251
ANAU
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L QB x
L QW x
128 to 255
Byte Addresses of Output Modules
Control Program
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0 to 125
L PY x
L PW x
A I x.x
L IB x
L IW x
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T PY x
T PW x
= Q x.x
T QB x
T QW x
PIQ
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Figure 5-8. Loading Input and Output Values
Note
The PII is not updated in the case of direct read access with the ”L PY x”, ”L PW x”
statements.
5-8
EWA 4NEB 811 6148-02
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