Siemens SIMATIC ET 200SP Manual page 37

Configuring/address space
4.4 Control and feedback interface
Feedback bit/value
Value_1_Active
Value_2_Active
G1_XIST1
G1_XIST1
G1_XIST2
G1_XIST2
36
Description
Mode = 0 (Reference mark search):
This bit indicates that the reference mark in G1_XIST2 has been read out via the reference
switch input CHn.RS.
Mode = 1 (Measurement on the fly):
This bit indicates that a measuring input value has been read out in G1_XIST2 via the rising
edge of digital input CHn.MI.
This bit indicates that a measuring input value was read out in G1_XIST2 via the falling edge of
digital input CHn.MI.
This value is the incremental actual position value. G1_XIST1 corresponds to the number of
output pulses, which control the speed of the drive.
With Mode = 0 (Reference mark search), this value supplies the detected reference mark.
With Mode = 1 (Measurement on the fly), this value supplies the detected measuring input
value.
If an error has occurred, G1_XIST2 indicates the associated error code. For the meaning of the
error codes, see the table below.
Technology module TM PTO 2x24V (6ES7138‑6EB00‑0BA0)
Equipment Manual, 09/2021, A5E50983437-AA