Siemens SIMATIC S7-300 Manual page 93

Table 6-3
BAR
AMF
PBR
T-L
PEH
FR+
FR–
ME
SYN
DF
FIWS
TFGS
WFG
PARA
6.3 FC RD_COM (FC 3) – Process read jobs cyclically
Task You can use FC RD_COM to execute read jobs. To do this, call
FC RD_COM once in the OB1 cycle.
The last read job must have finished processing, i.e. JOB_RD.NO in the user
DB (data byte DBB2) must have been cleared and status bit JOB_RD.DONE
enabled.
You initiate a new read job by entering the read job no. in JOB_RD.NO.
Do not include FC RD_COM in your user program if you do not process any
read jobs.
The FC performs the following action:
Executes the read job (JOB_RD) from the user DB, transfers the associated
data into the user DB, and displays the read job status.
FM 354 Servo Drive Positioning Module
Control/checkback signals, continued
German English
MODE Active operating mode
STR_MF Modify M function
PR_BACK Program scanning backward
DT_RUN Dwell time running
POS_ROD Position reached and stopped
GO_P GO_plus
GO_M GO_minus
MSR_DONE Measurement done
SYNC Channel synchronized
DATA_ERR Data error
FAVEL Flying actual value done
TST_STAT Switchover, P-BUS port done
WAIT_EN Wait for external enable
PARA Channel parameterized
Programming the FM 354
Significance
6-13