The basics of counting, measurement and position detection
2.4 Basics of counting (digital input modules)
Counting, measurement and position detection
82 Function Manual, 12/2017, A5E32009889-AG
Counting with pulse encoders
Counting refers to the detection and summation of events. The modules' counters record and
evaluate pulse signals. The counting direction can be specified using encoder or pulse
signals or through the configuration.
You can use feedback bits to switch the digital outputs of digital output modules exactly at
defined counter values, independent of the user program.
You can configure the characteristics of the counters using the functionalities described
below.
The counter limits define the counter value range used. The counter limits are configurable
and can be modified during runtime using the user program. See the module's device
manual for the maximum and minimum configurable counter limits.
You can configure whether the counting processes are terminated or continue when a
counter limit is violated (automatic gate stop).
You can configure a start value within the counter limits. The start value can be modified
during runtime with the user program.
Opening and closing the hardware gate and software gate defines the period of time during
which the counting signals are recordd.
The hardware gate is controlled externally via a digital input of the technology module. The
hardware gate can be enabled through parameter assignment. The software gate is
controlled via the user program. A description of the control and feedback interface is
available in the device manual for the digital input module.
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