Latch Function - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count24V
2.6 Count Modes
2.6.7

Latch Function

Introduction
There are two latch functions:
● The Latch and Retrigger function
● The Latch function
The Latch and Retrigger Function
Requirement
In order to use this function, you must first select it with the "Latch and Retrigger on Positive
Edge" parameter from the possible functions of the digital input.
Description
Figure 2-9
This function stores the current internal counter status of the 1Count24V and retriggers
counting when there is a positive edge on the digital input. This means that the current
internal counter status at the time of the positive edge is stored (latch value), and the
1Count24V is then loaded again with the load value, from which counting resumes.
The counting mode must be enabled with the SW gate before the function can be executed.
It is started with the first positive edge on the digital input.
The stored counter status rather than the current counter status is indicated in the feedback
interface. The STS_DI bit indicates the status of the latch and retrigger signal.
32
Latch and Retrigger with Load Value = 0
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07