Blocks and Their Functions S5-95F
Execution Times of FB252
Table 9-11. Execution Times of FB252
Test Component Parameter AUFT Execution Times
CPU 00
H
approx. 87 ms
Operating system
comparison
01
H
approx. 20 s
Due to its long execution time, the test can be called
only with parameter EINZ = 1
RAM with STEP 5 objects 02
H
approx. 2.8 ms per STEP 5 statement
Onboard DI 03
H
approx. 97 ms
Onboard DQ 04
H
approx. 230 ms
Onboard interrupt DI 05
H
approx. 68 ms
Onboard counters 06
H
95 ms for one counter, 190 ms for 2 counters
External I/Os, DI 07
H
500 ms to 800 ms depending on configuration of LAN
External I/Os, DQ 08
H
500 ms to 800 ms depending on configuration of LAN
Processor RAM 09
H
max. 5 ms
Memory submodule 0A
H
max. 5 ms
Power failure routine 0B
H
max. 5 ms
Scan time monitor 0C
H
approx. 800 ms
Load voltage failure
routine
0D
H
max. 5 ms
Logical program counter 0E
H
max. 5 ms
Short-circuit test 0F
H
For onboard DI: 12 ms per test DQ
For at least one external DI: 19 ms per test DQ
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Example: Execution of Short-Circuit Test
Test digital input DI 32.3 via digital output DQ 33.2 for short circuit. You have
programmed this circuit with COM 95F. You will find the following entry in DB1:
KT DQ 33.2 32.3; (DQ 33.2 tests DI 32.3)
You store the condition for calling the short-circuit test in flag 10.0. Flag 10.6 = 1 and
flag 10.7 = 0.
9-20
EWA 4NEB 812 6210-02