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Principle of
This function works together with a user DB. The structure of the user DB
Operation
can be found in the library FMSTSVLI in data type
UDT 1. You need one user DB for each channel which contains entries for
addressing the FM 453 and the data for the individual functions of the FM
453. The DB number is passed when you call the FC with the DB_NO pa-
rameter.
What does the user have to do?
User program
according to job no.
4.
Evaluate status
3.
e.g. write job possible
Set mode and correspond-
ing control signals
1.
Evaluate mode and corre-
sponding checkback signals
2.
Enter system data
1) Before the appropriate write job no. is set in the user DB, the system data to be written
must be entered.
Error Evaluation
Errors which occur are indicated in the binary result (BIE = 0).
Possible errors are:
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
User DB
Write job no.
Status of FC 2
Read job no.
Status of FC 3
Control signals
Checkback signals
1)
System data –
data/values for
write jobs
System data –
data/values
returned by the
FM 453
Unknown write job (see JOB_WR.UNKNOWN)
Data transfer error during communication with SFC 58 "WR_REC". The
error is returned in the output parameter RET_VAL (see reference manual
System Software for S7-300/400; System and Standard Functions).
The transferred data are verified and interpreted by the module. If a data
error occurs, CHECKBACK_SIGNALS.DATA_ERR in the user DB
structure is set to "1". Further information on data errors can be found in
the parameterization tool in the menu Test Troubleshooting and in Sec-
tion 11.
Programming the FM 453
What is done by the
FC 2?
Scan/clear
Set/clear
"edge generation"
of R+, R–, ST, de-
pending on mode
Transfer to FM
Transfer from FM
Transfer system
data to FM
according to job no.
FM 453
6-7
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