Description of Units and Circuit Boards
15 - 428
NOTICE
When connecting an inductive load to the output circuit, connect a flyback (snubber) diode
in parallel to the inductive load to suppress the surge voltage. Not using the flyback
(snubber) diode may damage the output circuit.
When connecting the load with a large inrush current such as the lamp, connect the current
limiting resistor in series to the load, so that the output current does not exceed its maximum
value. Exceeding the maximum output current value may damage the output circuit.
Refer to chapter 15.18 "Assignment of universal I/O signals" from 433 about the maximum
current of the transistor and the relay output circuits.
• Specific I/O signal related to start and stop.
The following signals are specific I/O signals related to start and stop.
• SERVO ON (depending on application:
• External SERVO ON (common to all application)
• External start (depending on application)
• Operating (depending on application)
• External hold (common to all application)
• External emergency stop (common to all application)
General purpose I/O board
Inductive load
Flyback diode
Lamp
Current limiting resistor
Timing chart
Robot
While SERVO-ON
SERVO-ON
External start
Operating
External hold
External emergency stop
Note: Set T = 100 ms minimum
1
+24VU
024VU
1
2
3
5 4
2
3
4
5
1
RUN
STOP
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
1
2
3
4
5
6
7
T
T
T
2
3
4
5
6
7
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