Siemens SIMATIC FM 353 Manual page 100

Programming the Technological Functions
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)
Single functions and single commands are also requred to control the FM 353.
All single commands and single functions that are active when the POS_CTRL
block is called are transferred. The single commands are cancelled following trans-
fer, even in the event of an error.
Operating Modes
System Data
Single functions
Single commands
x Data are accepted or processed.
V Data required to move the axis.
6-20
= 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
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 MDI
x
V V V
x x x x
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
See
A/AE
Sect.
9.3.2
V V
x x 9.3.3