Siemens SIMATIC FM 453, Manual

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6-23
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
6.5 FC MSRMENT (FC 5) – Read Measured Values
You use FC MSRMENT to read the measured values into the user DB (start-
ing at address 60). You can call FC MSRMENT in OB 40, if the process in-
terrupt was activated (see Section 5.2 ), or in OB 1. You are not allowed to
call FC 5 simultaneously in both OBs.
Call in LAD Notation
(ladder diagram)
Call in STL Notation
(statement list)
EN ENO
FC MSRMENT
IN_MSR
DB_NO RET_VAL
CALL MSRMENT(
DB_NO := ,
RET_VAL := ,
IN_MSR := );
The following table describes the parameters of FC 5
.
Name Data
Type P
Type
Meaning
DB_NO WORD I Data block number
RET_VAL INT Q Return code of SFC 59 “RD_REC”
IN_MSR BOOL I/O Start Read process
Parameter types: I = input parameter, Q = output parameter,
I/O = in/out parameter (initiation parameter)
This function works together with a user DB. The DB number is passed when
you call the function with the DB_NO parameter.
Reading of the measured values MEASUREMENT_VALUES (in user DB
starting at address 60) is started when you set the in/out parameter IN_MSR
to one. The parameter is reset by the FC after the job is executed. The FC
must be called up until it has reset the in/out parameter. When the FM 453 is
used centrally, the Read job is processed within a single function-block cal-
lup. When the FM 453 is used in a distributed configuration, it may take sev-
eral function block calls to process the read job (only applies when called in
OB 1).
The in/out parameter remains set while the job is running. Data transfer is
complete when the in/out parameter is reset (IN_MSR = FALSE).
Task
Call Options
Description of
Parameters
Principle of
Operation
Programming the FM 453