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8. SPECIFICATIONS AND WIRING OF THE I/O BLOCKS
8.6 Handling of the Transistor Output Circuit
8.6.1 Transistor output circuit
(1) Output terminals
The transistor output type is a 4-, 8- or 16-points/1-common output type. Use a 5
to 30VDC smoothing power supply as a load driving power supply.
+
5 to 30VDC
COM1
(2) Circuit isolation
The PLC internal circuit and output transistors are optically isolated by
photocouplers. The common blocks are also separated each other.
(3) Operation indication
When the photocoupler is driven, the LED is lit and the output transistor switches
on.
(4) Response time
The time from when the photocoupler is driven (or shut off) by the PLC to when
the transistor switches on (or off) is 0.2ms max.
Note that the OFF time of the transistor is longer under lighter load.
For example, the response time is 0.5ms under a 24VDC 60mA load.
When a high response level is needed under light load, provide a dummy resistor
to increase current.
Load
+
5 to 30VDC
(5) Output current
0.5A current can flow per output point.
However, the current used should be 0.8A per 4 points (0.2A per point on
average) to limit temperature rise.
The ON voltage of the output transistor is approx. 1.5V.
Therefore, when driving a semiconductor device, etc., note the input voltage
characteristic of the device used.
(6) Open-circuit leakage current
0.1mA max.
Y000
50V
Zener
Photocoupler
PLC
Dummy
resistor
Y000
60 to 200mA
COM1
8 - 13
LED
PLC
MELSEC-A
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