Siemens SIMATIC S7 System Manual page 283

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Example: high-speed counter instruction

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

On the first scan, call SBR_0.

On the first scan, configure HSC0:

1. Enable the counter

Write a new current value.

Write a new preset value.

Set the initial direction to

Select the reset input to be ac-

Select 4x mode.

2. Configure HSC0 for AB quadra-

ture phase with reset input.

3. Clear the current value of HSC0.

4. Set the HSC0 preset value to 50.

5. Attach event 12 to interrupt rou-

tine INT_0. The interrupt is exe-

cuted when HSC0 current value =

preset value.

6. Global interrupt enable

7. Configure HSC0.

Program instructions

7.6 Counters

MOVB 16#F8, SMB37

MOVD +0, SMD38

MOVD +50, SMD42

ATCH INT_0, 12

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Simatic s7-200 smart