6
6-11
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
If it is not possible to call an operating mode or the control of an active oper-
ating mode is not possible or has been incorrectly carried out, the relevant
module signals this by setting the parameter OT_ERR. The operating mode
cannot be controlled until the error is acknowledged by a signal on the input
OT_ERR_A.
“Cannot be controlled” means that you cannot start a new operating mode
nor continue the stopped operating mode.
After the FC has been executed, the binary result is set to BIE = 1.
Apart from the general parameters for controlling the operating mode blocks
and handling the errors from them, there are special input and output parame-
ters for each operating mode. These parameters are introduced and explained
in the description of the function blocks.
All function calls for operating modes use the following parameters, the de-
scription of which is identical:
Parameter Meaning
DRV_EN Drive enable:
TRUE - the drive enable is switched on.
FALSE - the drive enable is switched off.
OT_ERR Operating error; the FM 351 signals an operating error.
An operating error can be more exactly analyzed via the parameteriza-
tion interface.
OT_ERR_A Operating error acknowledgment;
You acknowledge a prevailing operating error by setting the parameter
to the value “1”. The movement cannot be continued nor a new ap-
proach be started while ever the operating error is present.
START Starts the present operating mode; the direction is determined by the
FM 351.
The FC resets the parameter when the FM 351 has accepted the com-
mand.
DIR_M Starts the present operating mode in the negative direction.
The FC resets the parameter when the FM 351 has accepted the com-
mand.
DIR_P Starts the present operating mode in the positive direction.
The FC resets the parameter when the FM 351 has accepted the com-
mand.
STOP Terminates the present operating mode.
EN;EN0 These parameters are only necessary in the LAD representation. Here,
pay attention to the user manual Standard Software for S7 and M7;
STEP 7.
OT_ERR
Binary Result BIE
Specific
Parameters
General
Parameters
Programming the FM 351
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