Various Special Relays For Operation Commands; Forward Rotation Limit And Reverse Rotation Limit - Mitsubishi Electric FX3S Series User Manual

FX /FX /FX
3S 3G 3GC
Built-in Positioning Functions
4.3

Various Special Relays for Operation Commands

4.3.1

Forward Rotation Limit and Reverse Rotation Limit

When using the servo motor, the forward rotation limit and the reverse rotation limit can be set for the servo
amplifier.
To use the DOG search function for zero return, or to set the forward rotation limit or the reverse rotation limit
for operations other than zero return using the PLC, set the forward rotation limit 1 (LSF) and reverse rotation
limit 1 (LSR) for the PLC so that these limit switches can be activated before the forward rotation limit 2 or
reverse rotation limit 2 of the servo amplifier.
As shown in the following figure, interlock the forward rotation limit 1 (LSF) with the forward limit relay, and the
reverse rotation limit 1 (LSR) with the reverse limit relay. If the forward limit relay or the reverse limit relay turns
ON, the motor will perform operation depending on the output instruction as shown in the following table.
Reverse rotation limit 2
(Servo amplifier side)
Servo motor
Forward rotation limit 1
Reverse rotation limit 1
Use the relays shown in the following table to determine the forward rotation limit and the reverse rotation limit
for each pulse output destination device (Y000, Y001, Y002, Y003).
Pulse output
destination
device
Y000
Y001
Y002
Y003
*1.
*2.
*3.
*4.
Note:
If the forward rotation limit (LSF) and the reverse rotation limit (LSR) cannot be set, observe the following
items:
• Even if forward rotation limit 2 or reverse rotation limit 2 turns ON and the servo motor is automatically
stopped, the positioning instruction currently being activated cannot recognize the motor being stopped.
Therefore, pulses will be continuously output until the instruction is deactivated.
• The DOG search function of the DSZR instruction (zero return instruction with DOG search function)
cannot be used.
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/FX /FX PLC User's Manual - Positioning Control Edition
3U 3UC
Reverse rotation limit 1
(Programmable
controller side)
LSR
Reverse rotation
M8343
M8344
Forward limit
relay
M8343
M8353
*1
M8363
*2
M8373
Y002 is not available in FX
Y003 is available only when two high-speed output special adapters are connected to the FX
M8338 is supported in the FX
PLC is used and its version is below Ver. 2.20, the PLSV instruction will perform operation in the
M8338 = OFF mode (will perform operation without acceleration/deceleration).
Only available for FX and FX
3U
search engine
Forward rotation limit 1
(Programmable
controller side)
LSF
Forward rotation
Forward limit relay for Y000
Reverse limit relay for Y000
Reverse limit
PLSV instruction
relay
(M8338
M8344
If the corresponding rotation
M8354
limit relay is turned on,
M8364 pulse output (operation) will
immediately stop.
M8374
PLC (14-point and 24-point type) and FX
3G
PLC Ver. 2.20 or later and FX
3UC
PLCs.
3UC
4.3 Various Special Relays for Operation Commands
Forward rotation limit 2
(Servo amplifier side)
Corresponding instruction and stop
DSZR, DVIT
PLSV(M8338
*3
=OFF)
and DRVA instructions
If the corresponding rotation
the
limit relay is turned on, the
speed will decelerate, and
operation will stop.
/FX PLC.
3S 3GC
/FX /FX /FX
3S 3G 3GC
4 Before Programming
A
B
Apx.
*4
, ZRN,
*3
=ON), DRVI,
the
PLC.
3U
PLC. If an FX
3U 3UC
B - 57