6. Function blocks
6.1 Manufacturer function blocks
• Range A:
– The counter range has the value zero.
– The contacts CH..ZE (actual value equal to zero) and CH..FB (lower threshold value undershot) are act-
ive.
– The counter receives pulses and increases the actual value.
– CH..ZE drops out as well as CH..FB after the lower threshold value is reached.
• Range B:
– The counter relay counts upwards and reaches the upper threshold value.
The contact “upper threshold value” CH…OF becomes active.
• Range C:
– The coil CH..SE is briefly actuated and the actual value is set to the start value.
The contacts go to the respective position.
• Range D:
– The counting direction coil CH..D_ is actuated. If counting pulses are present, downward counting is
initiated.
– If the lower threshold value is undershot, the contact CH..FB becomes active.
• Range E:
– The reset coil CH..RE is activated. The actual value will be set to zero.
– The contact CH…ZE is active.
• Range F:
– The actual value goes outside the value range of the counter relay.
– The contacts OF, FB, ZE become active according to the direction of the values (positive or negative).
Retention
Counter relays can be operated with retentive actual values. You can select the num-
ber of retentive counter relays in easySoft 8Project view/System settings tab. The
retentive actual value will require 4 bytes of memory space. If a counter relay is
retentive, the actual value will be retained when the operating mode switches from
RUN to STOP and when the power supply is switched off. If the device is started in
RUN mode, the counter relay will continue to work with the non-volatile actual value.
See also
→ Section "C - Counter relay", page 304
→ Section "CF - Frequency counter", page 310
→ Section "CI - Incremental counter", page 322
→ Section "Timing and counter relay example", page 616
easyE402/24 MN050009ENEaton.com
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