S5-95F Installing and Connecting the Basic System
4.5.3 Scanning and Resetting the Counter Status
Table 4-8 shows the different possibilities of scanning the counters. The table is followed by a
program example that shows how to enter a new comparison value.
Table 4-8. Addresses and Counter Access Possibilities
1
x = Comparison value, up to which the counter should count (you must enter this to enable triggering of an interrupt)
Addresses and Counter Access Possibilities
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Location of counters Counter A: IB 36 ... 37
Counter B: IB 38 ... 39
Scanning the counter status
by reading in the PII
(the value read in corresponds to the last signal state read into
the PII.)
by direct I/O access
(the value read in corresponds to the current signal state.)
LIW36
LIW38
LPW36
LPW38
Reset counter status to "0" and input new comparison value. LKFx
1
TPW36
TPW38
Example: Presetting a new comparison value for counter A.
STL Explanation
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OB3
A I 61.0
R I 61.0
JC FB 10
BE
Counter A counted until a comparison value was
reached. An interrupt was triggered. Reset the set bit
61.0 in the diagnostic byte.
The program branches to FB10.
STL Explanation
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FB10
LKFx
TPW36
BE
Reaction to "comparison value reached" in the user
program.
Load the new comparison value x into ACCU 1 and
set counter A
EWA 4NEB 812 6210-02
4-21
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