Description of Functions
9-6
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
9.1.2 Checkback signals
Overview
The checkback signals indicate the processing status of the axis and report it to
the user program.
Table 9-2 describes the checkback signals and their functions.
Table 9-2 Checkback signals
Symbol
English Ger-
man
Significance Function
TST_STAT TFGS Sw./over P
bus interface
complete
Communication with the user program is not possible, since the
P bus interface has been switched over for operation with the
start-up tool.
OT_ERR BF/FS Operator/
travel errors
... signaled to the user if an operator-control error or travel error is
pending (e.g., unallowed control signal has been set, (R+) and
(R−) set simultaneously) An error message causes the move-
ment to be canceled.
See Section 11
DATA_ERR DF Data error ... is reported to the user when a data error occurs.
see Section 11
PARA PARA Parameterize ... module parameterized. All machine data applicable for control
of an axis are present on the module.
ST_ENBLD SFG Start enable ... signals that the FM 353 is ready for positioning and output.
S “Start enable” is set:
− if no static stop or error is pending and the drive enable is
pending
− if the mode setting and mode checkback match (after
mode change)
− if no axis functions (including M output, dwell time) are
active, or after functions have been completed
− for further processing of a function interrupted with unpro-
grammed stop
− in Automatic mode, after program has been selected (one
program active) and after M0, M2, M30, or at end of block
with Automatic single-block
S “Start enable” is deleted:
− if a function has been started and is active, or
− if a start condition is active (stat.)
− if there is an error and an unprogrammed stop
S Without Enable Start, none of the functions that can be oper-
ated with Travel Plus, Travel Minus and Start can be exe-
cuted.
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