Siemens SIMATIC FM 453, Manual

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9-20
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Note
Please see also Section 9.1.3!
Preconditions:
S
The FM 453 has been parameterized.
S
The mode has been selected and confirmed
S
Drive enable [AF] = 1 (control signal, FC MODE_WR)
S
Stop [STP] = 0 (control signal, FC MODE_WR)
S
Servo enable (RF) = 1 (FC MODE_WR, job no. 10)
Table 9-4 Control Actions for “Reference point approach” Mode (examples)
Signal Name Level Explanation
Control action 1, enable “Reference point approach” mode
Control signal:
Mode [BA]
Checkback signals:
Active mode [BAR]
Start enable [SFG]
The user initiates a [BA] command.
The module returns [BAR] and [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]
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.
Control action 3, reference point switch (RPS) reached
RPS
Encoder zero marker
Checkback signals:
Travel plus [FR+]
Travel minus [FR–]
Synchronized [SYN]
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).
Control Actions
Description of Functions