2. Preparation
■Output Circuit
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| USER I/O power supply source selector slide switch | |||||
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| Up position: Externally supplied 24V | |||
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| Down position: Internal 24V (default setting) | |||
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| User external power supply connector | |||||
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24V |
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| S1 |
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| PC board side: | ||||||
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| (Phoenix Contact Inc.) | |||||||
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| Note1) 24V |
| 0V | |
0V | 24V IN |
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0V IN
I/O connector
0V PC board side
TLP127 |
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20 |
| current |
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SO1 | X1 | Relay coil voltage | ||
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| Maximum | |||
54 | 0.1A Diode | (DC 24V) | ||
SO2 | X2 |
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21 | (ERROR) |
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SO3 |
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| (BARRIER) |
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| SO4 |
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| (DRIVE) |
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Reservation
SO8 output
(Reservationoutput )
L1 L 2
68 |
| Note1) When USER I/O power supply |
L 22 | X30 | |
18 |
| source selector slide switch |
COM1 |
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| is set to 24V. | |
52 |
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19 |
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53 |
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Thermistor (1A)
Controller side 
User side
◆Add the diodes as shown when relay coils are connected as the load.
◆Be careful that the thermistor operates to shut down the +24 V power supply when 24 V output is used and the current of 1 A or more flows. Modify the external circuit to reduce the current capacity to 1 A or less. Thermistor shuts down the +24 V power supply and
NOTE returns when the main power is turned on again.
(The maximum current capacity of internal power supply is 1 A.)
◆Be careful that current capacity is maximum 0.1 A per one output point.
◆Be sure to use a shielded cable for I/O connection. The maximum length of a shielded cable is 1.0 m. Use the core conductor of the shielded cable.