Siemens SIMATIC FM 353 Manual page 111

Call options
The POS_CTRL block requires an instance data block (DB) when called. The DB
IFFM_ICTRL (DB1) is part of the "FM353_354" library and at the same time inclu-
des the user interface. For more information, please refer to Section 6.4.6.
You must call the POS_CTRL block cyclically (e.g. once in the OB 1 cycle). Before
you call the function, enter all data/signals in the user DB (AW-DB) which are re-
quired to execute the intended functions.
EN
Parameters
The POS_CTRL block possesses neither input, nor output parameters.
Return values
The POS_CTRL block delivers the following return values in the RETVAL instance
variable:
RET_VAL
1
0
< 0
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Call in LAD representation
(ladder diagram)
IFFM_ICTRL
POS_CTRL
ENO
BR
1 At least 1 job/transfer in progress
1 No job/transfer in progress, no error
0 Error:
S
Data error (AW-DB, DBX22.4)
S
Communication error (AW-DB, DBW66)
Programming the Technological Functions
Call in STL representation
(statement list)
CALL POS_CTRL, IFFM_ICTRL
Description
6-31