Siemens SIMATIC S7-300 Manual page 200

Description of Functions
Table 9-5 Control actions for "Incremental relative" mode (examples), continued
Signal name
Control action 3, stop during positioning
Control signal:
Stop [STP]
Checkback signals:
Travel minus [FR–]
Start enable [SFG]
Control action 4, error during traversing movement
Checkback signals:
Travel plus [FR+]
Processing in progress [BL]
Control signal:
Acknowledge operator con-
trol/travel error [BFQ/FSQ]
Checkback signals:
Start enable [SFG]
Control signal:
Direction plus [R+]
Checkback signals:
Travel plus [FR+]
Processing in progress [BL]
Control action 5, change mode
Control signal:
Mode [BA]
Checkback signals:
Active mode [BAR]
Travel plus [FR+]
Processing in progress [BL]
9-24
Level
If Stop is enabled during positioning, the axis stops. [FR–] is
reset, and [SFG] is activated. [PEH] is not output, since posi-
tioning is not complete.
Before the axis comes to a standstill, it is possible to define a
new direction "through start".
The axis moves.
An error is output during the traversing movement. [FR+]
and [BL] are canceled, and [BFQ/FSQ] is enabled.
When the error has been acknowledged, the start enable is
activated. The movement can be restarted with [R+].
[FR+] and [BL] are activated.
[SFG] is canceled.
[BA] is deactivated during the traversing movement.
The axis is stopped by way of the deceleration ramp. [FR+]
and [BL] are reset.
Explanation
FM 354 Servo Drive Positioning Module