Description of Functions
9-9
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Table 9-2 Checkback signals, continued
Symbol
FunctionSignificance
English
FunctionSignificance
Ger-
man
POS_RCD PEH Position
reached,
Stop (“PEH”)
S When the preset target position is reached correctly, (PEH) is
actuated, and remains in effect until the next axis movement.
S (PEH) is actuated only in the following modes and cases:
− Reference-point approach: If the reference point has
been reached in full (including reference-point shift).
− MDI, Incremental relative: If the preset position has been
reached.
− Automatic: If a traversing block has been positioned in full
and the axis remains motionless until the next traversing
movement.
S It is not set if no synchronization is available yet.
ACT_POS ACT_
POS
Actual posi-
tion
The firmware version V3.8 of the FM 353 positioning module in
conjunction with the blocks of the “FM353_354” block library pro-
vides direct access to the actual value. This is stored in the
checkback signals during the module cycle (2 ms) and read by
the POS_CTRL block. In addition, as previously, the actual value
is included as a DINT variable in the basic operating data read
request.
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