Siemens SIMATIC FM 353, Manual

Page: 91 / 361

Programming the Technological Functions
6-11
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Function description
The POS_INIT block carries out the following actions:
1. Entry of addressing values in user DB AW-DB, If parameter LADDR
≠
0
Module address
2. Deletion of the following structures in user DB AW-DB:
− Control signals
− Checkback signals
− Initiate, Ready and Error signals for the job requests
− Single functions and single commands and their Ready and Error signals
3. If the input parameter LADDR = 0, no address is entered in the user DB. It is
assumed that the addressing values (module address) have been entered
manually via ”Parameterize FM 353” (button ”Enter Mod-Adr in user DB” in
main display).
Error evaluation
An error is signalled by the binary result BR = 0 or by RET_VAL < 0.
Possible errors are:
S Unknown channel number CH_NO and DB no. = 0 as input parameters; the
AW-DB is not initialized.
S If no AW-DB is found, the CPU goes to STOP; view the CPU’s diagnostic
buffer.
RET_VAL Error
− 1 Unknown channel number
− 2 DB number = 0