Configuration Of The Hsc - Siemens S7-1200 System Manual

Note
The digital I/O points used by high-speed counter devices are assigned during CPU device
configuration. When digital I/O point addresses are assigned to HSC devices, the values of
the assigned I/O point addresses cannot be modified by the force function in a watch table.
9.1.2

Configuration of the HSC

Risks with changes to filter time setting for digital input channels
If the filter time for a digital input channel is changed from a previous setting, a new "0"
level input value might need to be presented for up to 20.0 ms accumulated duration before
the filter becomes fully responsive to new inputs. During this time, short "0" pulse events of
duration less than 20.0 ms may not be detected or counted.
This changing of filter times can result in unexpected machine or process operation, which
can cause death or serious injury to personnel, and/or damage to equipment.
To ensure that a new filter time goes immediately into effect, power cycle the CPU.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
WARNING
You may configure up to 6 high-speed counters. Edit
the CPU device configuration and assign the HSC
properties of each individual HSC.
Enable an HSC by selecting the "Enable" option for
that HSC
Use the CTRL_HSC instruction in your user program to
control the operation of the HSC.
.
Technology instructions
9.1 High-speed counter
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