Siemens SIMATIC S7-300 Manual page 209

Table 9-8 Control actions for "Automatic" mode (examples), continued
Signal name
Control action 5, traversing block with dwell
Checkback signals:
Travel plus [FR+] or Travel
minus [FR–]
Dwell time running [T-L]
Position reached, stop [PEH]
Control action 6, cancelation of the read–in enable during program execution (special situation)
Control signal:
Read–in enable [EFG]
Checkback signals:
Travel plus [FR+] or Travel
minus [FR–]
Position reached, stop [PEH]
Control action 7, resume program execution after read–in enable (special situation)
Control signal:
Read–in enable [EFG]
Checkback signals:
Travel plus [FR+] or Travel
minus [FR–]
Position reached, stop [PEH]
Control action 8, stop during positioning with new start signal for resumed positioning
(special situation)
Control signals:
Stop [STP]
Start [ST]
Checkback signals:
Position reached, stop [PEH]
Travel plus [FR+]
Start enable [SFG]
Processing in progress [BL]
Control action 9, end of program reached
Checkback signals:
Travel plus [FR+] or
Travel minus [FR–]
Processing in progress [BL]
Position reached, stop [PEH]
M function number [MNR]
Start enable [SFG]
FM 354 Servo Drive Positioning Module
Level
During processing of a traversing block with dwell, the dwell
time t [T-L] and [PEH] are output.
0
t
0
If [EFG] is canceled during program execution, the current
block is processed up to the end, and program execution is
then suspended.
[FR+] and [FR–] are reset.
[PEH] is actuated.
The program resumes on [EFG].
[FR+] and [FR–] are reset.
[PEH] is reset.
Interrupt with Stop
[FR+] is cleared when the axis comes to a standstill, and
[SFG] is enabled (if Stop is not active). [PEH] remains
cleared, since the defined position has not yet been reached.
Start clears [SFG] and enables [FR+] again.
[BL] remains enabled.
Before the axis comes to a standstill, it is possible to restart
"through start".
The end of the program is indicated by the enabling of
[PEH], output of M2, M30 and resetting of [BL].
Description of Functions
Explanation
9-33