Siemens SIMATIC FM 353 Manual page 119

The checkback signals "Process in progress" and "Position reached. Stop" are not
reported back to the user program until the FM has detected and processed the
Start signal (v 2 FM cycles).
When calling the POS_CTRL block and the relevant control/checkback signals,
the subsequent signals are generated so that starting of the procedure can be de-
tected earlier than would otherwise be the case.
Signal
Execution started
(AW-DB, DBX13.6)
Position
(AW-DB, DBX13.7)
Furthermore, various settings and commands are required to control the FM 353.
In all cases, those commands and settings are transferred which are activated at
the time when the POS_CTRL block is called. The commands are canceled after
the transfer, also in case of error.
Operating Modes
System Data
Single functions
Single commands
x Data are accepted or processed.
V Data required to move the axis.
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
= TRUE When a mode/movement is started with the relevant
control signals or when the status for "Process in
progress" (AW-DB, DBX23.1) = 1
"Execution started"
"Process in progress"
= FALSE When status signal "Position reached. Stop." (AW-DB,
DBX25.7) = 0 is returned or when a mode is started
with the relevant control signals.
"Position"
"Position reached. Stop"
Write
Function
Request
Internal DBB34 and 35
Internal DBB36 and 37
Programming the Technological Functions
Description
when the block is called/
started
when the FM starts tra-
versing movement
when the block is called/
started
when FM starts traversing
movement
T STE REF SM
x
V V V
x x x x
See
MDI A/AE
Sect.
9.3.2
V V
x x 9.3.3
6-39