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

2.6

Count Modes

2.6.1

Overview

Principle
The counting modes are used in counting applications (for counting of items, for example).
For the "Counting modes" 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 1Count24V/100kHz.
Maximum Count Range
The high counting limit is +2147483647 (2
The low counting limit is -2147483648 (-2
Load Value
You can specify a load value for the 1Count24V/100kHz.
This load value is either applied directly as the new count value (LOAD_VAL) or it is applied
as the new count value when the following events occur (LOAD_PREPARE):
In the Count once and Count periodically counting modes:
• 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.
In all counting modes:
• The counting operation is started by a SW gate or HW gate (if the counting operation is
• Synchronization
• Latch and retrigger
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05
continued, the load value is not applied).
- 1).
31
).
31
1Count24V/100kHz
2.6 Count Modes
21