Siemens SIMATIC ET 200SP - Page 103

Using the High_Speed_Counter technology object
3.5 Configuring the High_Speed_Counter
Counting, measurement and position detection
102 Function Manual, 12/2017, A5E32009889-AG
Interface Standard (TM PosInput)
You use this parameter to specify whether the encoder outputs symmetric (RS422) or
asymmetric (TTL) signals for the TM PosInput.
You can select from the following options:
Interface standard
Meaning
RS422, symmetrical
(default)
The encoder outputs symmetric signals according to the RS422
standard (Page 69).
TTL (5 V), asymmetrical The encoder outputs asymmetric 5 V signals according to the
TTL standard (Page 67).
Note
The RS422 standard provides greater interference immunity than the TTL standard. If your
incremental or pulse encoder supports the RS422 standard and
the TTL standard, we
recommend using the RS422 standard.
Reaction to signal N
You use this parameter to specify which reaction is triggered to signal N.
You can select from the following options:
Option
Meaning
No reaction to signal N
(default)
The counter is not affected by signal N.
Synchronization at signal N
(Page 40)
The counter is set to the start value at signal N.
If you select the function "Enable synchronization at signal N" for a
digital input, the synchronization depends on the level at the digital
input.
Capture at signal N (Page 30)
The counter value is stored in the Capture value at signal N.
Note
You can only select the reaction to signal
N if you have selected the "Incremental encoder
(A,
B, N)" signal type.
Note
If "Synchronization at signal N" is selected, you can select the function "Enable
synchronization at signal
N" for a digital input (Page 106).