Count Modes; Overview - Siemens SIMATIC ET 200S Operating Instructions Manual

3.6

Count Modes

3.6.1

Overview

Introduction
The counting modes are used in counting applications (for counting of items, for example).
For the "Counting Mode" parameter, you can select from the following modes:
• Count continuously (for position detection with incremental encoders, for example)
• Count once (for counting items up to a maximum limit, for example)
• Count periodically (in applications with recurring counting operations, for example)
To execute one of these modes, you have to assign parameters to the 1Count5V/500kHz.
Maximum Count Range
The high counting limit is +2147483647 (2
The low counting limit is -2147483648 (-2
Load Value
You can specify a count value through a load value for the 1Count5V/500kHz.
This load value is either applied directly as the new count value (LOAD_VAL) or it is applied
as the count value when one of the following events occurs (LOAD_PREPARE):
• In the Count once and Count periodically counting modes
• In all counting modes
Gate Control
To control the 1Count5V/500kHz, you have to use the gate functions.
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05
– The low or high counting limit is reached when a main count direction is not assigned.
– The assigned high counting limit is reached when the main count direction is up.
– Zero is reached when the main count direction is down.
– The counting operation is started by a SW gate or HW gate (if the counting operation
is continued, the load value is not applied).
– Synchronization
– Latch and retrigger
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1Count5V/500kHz
3.6 Count Modes
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