Learning to Use the FX Family for Positioning Control FX2N-1PG-E positioning
4 - 40
MITSUBISHI ELECTRIC
Although the following ladder program is not very complicated, it is important to establish good pro-
gramming practice by paying attention to the order with which the PLC writes and reads to the buffer
memory of the FX
2N
-1PG-E. Before writing the operation command (START command) to the mod-
ule’s BFM from the PLC, several settings must be established such as target addresses 1 & 2, operation
speeds 1 & 2, and various settings such as the bias speed, maximum speed, and the acceleration/
deceleration time.
The most critical part of the program is the section where the operation commands are enabled by
writing bits M0 to M15 to BFM#25. When the positioning START command turns ON, the operation
begins with the specified settings.
The ladder program example on the following page can be programmed with an FX
2N(C)
or FX
3U(C)
PLC and does not require an actuator (i.e., servo system) for testing. The following inputs are used in
the program:
Inputs
X000 Error reset
X001 STOP command
X002 Forward rotation limit
X003 Reverse rotation limit
X007 2-speed positioning START command
Tab. 4-27:
Used inputs
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