User manual

Publication 1760-UM001A-EN-P
7-14 Retention
Retentive Up/Down
Counters C7, C8
How the Retention Works
The actual value of counter C7, C8 is retentive. When the condition for resetting
the counter is satisfied, the actual value of the counter will be reset.
Examples
Counting Parts
Task 1
Parts are packed automatically in a shipping carton. Even if there is a power outage,
the correct number should still be packed into the carton. When the carton is full,
the carton is removed manually and the counter reset.
Contacts and relays used:
Signal diagram:
U = Supply voltage
Coil Function
I5 Count parts
I6 Reset counter
Q1 Carton Full, signal lamp
C8 Up counter
DIR
CNT
RES
C8
+
{
I5---------CC8
C8---------{Q1
I6-C8------RC8
0042
0036
Circuit Diagram:
Parameters entered:
U