Siemens SIMATIC S7-300 Manual page 183

Table 9-2 Checkback signals, continued
Symbol
Significance Significance
English German
WORKING BL Processing in
progress
WAIT_EN WFG Wait for exter-
nal enable
DT_RUN T-L Delay time
running
PR_BACK PBR Processing in
reverse
MODE BAR Active mode
SYNC SYN Synchronism
MSR_DONE ME End of meas.
GO_P FR+ Travel
plus
GO_M FR– Travel Minus
FM 354 Servo Drive Positioning Module
... indicates that a function has been started with Start or Travel Plus/Mi-
nus, and is active.
"Processing in progress" is set with:
– "Jogging", "Control" mode during the movement up to stand-
still after cancelation of R+, R–
– Reference-point approach mode, during approach until reference
point is reached
– "MDI", "Incremental relative mode", during the positioning
process or while functions of the MDI block are being processed
– Automatic mode, during processing of a traversing program
until the end of the program.
"Processing in progress" is deleted:
– by errors and restarts
– by mode changes.
– after axis standstill
... takes effect only if a digital input has been parameterized by means of
MD34 (see Section 9.8.1).
Set: if the enable input has not yet been set or has been reset when a
movement has been activated.
... only active in Automatic and MDI mode.
As soon as a traversing block with a dwell time has been processed,
(T-L) is output during the programmed time period.
... is set after a Start in Automatic mode if a program is being processed
in reverse.
The selected mode is not fed back until it is internally active. For a
mode change, for example, a movement must be stopped before
another mode can become active (does not apply to switching
between Automatic and Automatic single-block modes).
... module is synchronized (see Section 9.6.3)
Required for axis motion in modes:
Incremental Relative
MDI
Automatic
... signals an executed measurement (see Section 9.3.10)
... means the axis is traveling in the direction of increasing actual values
or in the direction of voltage output "+" in OL control mode.
... means the axis is traveling in the direction of decreasing actual values
or in the direction of voltage output "–" in OL control mode.
As soon as an active travel movement is pending, the messages
(FR+) or (FR–) are output depending on the traversing direction.
They can only be pending as alternatives.
"Travel Plus" or "Travel Minus" is actuated at the start of the accel-
eration phase and remains active until the axis comes to a standstill
or the POS_ROD target area has been reached.
Description of Functions
Function Function
9-7