Functions; Detection Of Counting Signals - Siemens SIMATIC ET 200SP Manual

Product overview

2.2 Functions

2.2 Functions
2.2.1

Detection of counting signals

Counting refers to the detection and summation of events. The counters of the technology
module detect encoder signals and pulses and evaluate them accordingly. The count
direction can be specified using encoder or pulse signals or through the user program.
You can control the counting processes with the digital inputs.
You can specify the counter characteristics using the functions described below.
Counting limits
The counting limits define the counter value range used. The counting limits are configurable
and can be modified during runtime with the user program.
The maximum possible counting limit is 2147483647 (2
counting limit is –2147483648 (–2
You can configure the response of the counter at the counting limits:
● Continue or stop counting upon violation of a counting limit (automatic gate stop)
● Set counter value to start value or to other counting limit upon violation of a counting limit
Start value
You can configure a start value within the counting limits. The start value can be modified
during runtime with the user program.
Depending on the parameter assignment, the technology module can set the current counter
value to the start value upon synchronization, upon Capture function activation, upon
violation of a counting limit or when the gate is opened.
Gate control
Opening and closing the hardware gate and software gate defines the period of time during
which the counting signals are captured.
The control of the hardware gate takes place externally via the digital inputs of the
technology module. Control of the software gate takes place via the user program. The
hardware gate can be enabled through parameter assignment. The software gate (bit in the
control interface (Page 53) of the cyclic I/O data) cannot be deactivated.
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31
).
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Technology Module TM Count 1x24V (6ES7138-6AA00-0BA0)
–1). The minimum possible
Manual, 02/2017, A5E33002339-AB