Loading With Thezero Pulseand S~Lnput (Synchronization) - Siemens SIMATIC S5 IP 281 Equipment Manual

Operating Modes and Functions
6.5.1.2 Loading with the Zero Pulse and SET Input (Synchronization)
Method of The respective counter is loaded with the value stored
operation when the zero pulse occurs. The synchronization can be performed either
at the 1st zero pulse or at every zero pulse.
Synchronization can be performed either while counting up or counting
down.
Upward counting synchronization is performed at the rising edge of the
zero pulse under the following conditions.
– Enabling has been performed by the EUS control bit.
– The external S13 signal is on high level.
– The counter is counting up.
Downward counting synchronization is performed at the failing edge
of the zero pulse u;de; the following conditions.
– Enabling has been performed by the EDS control bit.
– The external S13 signal is on high level.
– The counter is counting down.
One–time,
counting upward,
synchronization
I
UP/DOWN
One–time,
counting downward,
synchronization
UP/DOWN J -
6 – 24
A
B
SET
N
t
Counter is loaded.
in
Counter is not loaded.
Counter is loaded. Counter is not loaded.
R 11/92
the load
register
- -
L
t