Function blocks
191
1SVC 440 795 M1100
High-speed counters
The display system provides four high-speed up/down
counters CH01 to CH04 for use. The high-speed counter
inputs are permanently connected to the digital inputs I1 to
I4. These counter relays allow you to count events
independently of the cycle time. You can enter upper and
lower threshold values as comparison values. The contacts
will switch according to the actual value. To specify a start
value, for example, counting from the value 1989, this can
be implemented using a CH… counter.
The CH… counters are not dependent on the cycle time.
Counter frequency and pulse shape
The maximum counter frequency is 3 kHz.
The signals must be square waves. The mark-to-space ratio is 1:1.
Wiring of a counter
The following assignment of the digital inputs apply.
• I1 count input for counter CH01
• I2 count input for counter CH02
• I3 count input for counter CH03
• I4 count input for counter CH04
You integrate a counter into your circuit in the form of a
contact and coil. The counter relay has different coils and
contacts.
Figure: 103: Display system circuit diagram with high-speed
counter
h
Avoid unforeseeable switch states. Only use each coil of a
relay once in the circuit diagram. Use a counter input for
the CF, CH, CI counters only once.
I 05---------------------------Ä CH01EN
I 06---------------------------Ä CH01RE
I 07---------------------------Ä CH01D_
I 08---------------------------Ä CH01SE
CH01OF-------------------------Ä Q 01
CH01FB-------------------------Ä Q 02
CH01ZE-------------------------Ä Q 03
CH01CY-------------------------S M 94
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