Control Actions For "Reference Point Approach" Mode (Examples) - Siemens SIMATIC S7-300 Manual

Description of Functions
Control actions Preconditions:
Table 9-4

Control actions for "Reference point approach" mode (examples)

Signal name
Control action 1, enable "Reference point approach" mode
Control signal:
Mode [BA]
Checkback signals:
Active mode [BAR]
Start enable [SFG]
Control action 2, move axis – positive direction
Control signal:
Direction plus [R+]
Checkback signals:
Travel plus [FR+]
Start enable [SFG]
Processing in progress [BL]
Synchronization [SYN]
Control action 3, reference point switch (RPS) reached
RPS
Encoder zero marker
Checkback signals:
Travel plus [FR+]
Travel minus [FR–]
Synchronized [SYN]
Control action 4, approach reference point
Checkback signals:
Traverse minus [FR–]
Position reached, stop [PEH]
Processing in progress [BL]
Start enable [SFG]
9-20
The FM 354 has been parameterized.
The mode has been selected and confirmed
Drive enable [AF] = 1 (control signal, FC MODE_WR)
Stop [STP] = 0 (control signal, FC MODE_WR)
Servo enable (RF) = 1 (FC MODE_WR, job no. 10)
Level
The user initiates a [BA] command.
The module returns [BAR] and [SFG].
When [SFG] is active, [R+] or [Start] are actuated, for exam-
ple.
The axis cancels [SFG], outputs the [BL] and [FR+] mes-
sages and travels here in the positive direction (defined in
MD).
An existing synchronization is reset.
When the RPS is reached, the velocity is reduced. The en-
coder is synchronized when the zero marker is detected. The
axis is positioned by traversing through the reference point
offset to the reference point (the direction is reversed if neces-
sary).
When reference point is reached.
[FR–] is canceled.
[PEH] is enabled.
[BL] is also canceled.
[SFG] is enabled
Explanation
.
FM 354 Servo Drive Positioning Module