Siemens SIMATIC FM 351 - Functions Which Write Data to the FM 351; List of the Fcs Which Write Data to the FM; Requirements for Calling Writing Functions

6
6-18
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
6.3 Functions which Write Data to the FM 351
All functions which transfer data to a channel in the FM 351 are included in
the group of write functions. The data is situated in the channel DB.
In Table 6-6 you will find all the FCs which have write access to the FM 351
channels.
Table 6-6 List of the FCs which Write Data to the FM 351
FC Name FC Task
REFPT ...used for the call setting the reference point.
ACT_VAL ...used for the call setting the actual value.
SNG_FCT ...used for the call setting single settings
 Creep speed
 Do not evaluate enable input.
SNG_COM ...used for calling the single commands.
 Delete residual distance.
 Set actual value / undo Set flying actual value.
TG254 ...used for transferring the value for the Increment 254.
TG253_5 ...used for transferring the selection for the Increment 255.
With all FCs pay attention to the general requirements quoted here in addi-
tion to the specific requirements:
Table 6-7 Requirements for Calling Writing Functions
Centralized Structure Decentralized Structure
Make sure that no other function blocks
(FCs) access this channel for writing.
Make sure that no other function blocks
(FCs) access this module for writing.
The function may only be called in the cyclic program.
When using a number of channels, the block for each channel must be called sepa-
rately.
The channel DB must be assigned with the appropriate values.
The parameter IN_**** must be set to start the FC.
The FC must remain called until the parameter IN_**** is reset by the FC.
Write Definition
Introducing the
FCs
Requirements
Programming the FM 351