Siemens SIMATIC ET 200SP Manual page 19

Gate control
Opening and closing the hardware gate (HW gate) defines the period of time during which
the counting signals are recorded.
The control of the hardware gate takes place externally via the digital inputs of the
technology module. The hardware gate can be enabled through parameter assignment. All
count signal are recorded when you do not configure a hardware gate. A software gate is not
available.
Technology Module TM Count 1x24V (6ES7138-6AA00-0BA0)
Manual, 02/2017, A5E33002339-AB
Product overview
2.2 Functions
19