Siemens SIMATIC FM 353 Manual page 234

Description of Functions
Table 9-8 Control actions for "Automatic" mode (examples)
Signal name
Control action 1, Automatic/Automatic single block mode
Control signals:
Mode [BA]
Read-in enable [EFG]
Checkback signals:
Active mode [BAR]
Start enable [SFG]
Control action 2, positioning by program selection
Program selection
(DBX39.5)
Control signal:
Start [ST]
Checkback signals:
Travel plus [FR+] or Travel
minus [FR−]
Start enable [SFG]
Processing in progress
[BL]
Control action 3, M function output
Checkback signals:
Change M function [AMF]
M function number [MNR]
Control signal:
Acknowledge M function
[QMF]
Control action 4, M function output and positioning
Control signal:
Acknowledge M function
[QMF]
Checkback signals:
Position reached, stop
[PEH]
Travel plus [FR+] or Travel
minus [FR−]
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Level
The user initiates [BA] and [EFG].
The module returns [BAR] and [SFG].
When [SFG] appears, the program can be activated by
[ST] when [EFG] is active.
Processing commences, e.g. with a positioning opera-
tion. [FR+] or [FR−] and [BL] are activated. [SFG] is
reset.
2nd M command
If M function output is acknowledgement-driven, for
example, the user program can continue to process
the [MNR] when [AMF] appears.
M function output is complete. [QMF] acknowledges
the M function, and [AMF] and [MNR] disappear.
Block with M output (same as control action 3) and
position is started.
The program is resumed on completion of the M func-
tion output. [FR+] and [FR−] are activated and [PEH] is
reset.
Explanation
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0