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12 Output Wiring Procedures
110
FX3S Series Programmable Controllers
User's Manual - Hardware Edition
12.1 External Wiring for Relay Output Type
12.1 External Wiring for Relay Output Type
This section explains "handling of relay output", "external wiring precautions" and "example of external
wiring".
For the relay output specifications, refer to Subsection 4.4.1.
12.1.1 Product life of relay contacts
For product life of relay contacts, refer to Subsection 14.4.2.
12.1.2 Handling of relay output
1. Output terminal
One common terminal is used for 1 or 4 relay output points.
The common terminal blocks can drive loads of different circuit
voltage systems (for example,100 V AC and 24 V DC).
2. External power supply
Use an external power supply of 30 V DC or less or 240 V AC or less
*1
for loads.
3. Circuit insulation
The PLC internal circuit and external load circuits are electrically insulated between the output relay coil and
contact. The common terminal blocks are separated from one another.
4. Display of operation
When power is applied to the output relay coil, the LED is lit, and the output contact is turned on.
5. Response time
The response time of the output relay from when the power is applied to the coil until the output contact is
turned on and from when the coil is shut off until the output contact is turned off is approx. 10 ms.
6. Output current
At a circuit voltage of 240 V AC or less
*1
, a resistance load of 2 A per point or an inductive load of 80 VA or
less (100 V AC or 200 V AC
*2
) can be driven.
For the life of the contact for switching an inductive load, refer to Subsection 14.4.2.
When an inductive load is switched, connect a diode (for commutation) or a surge absorber in parallel with
this load.
7. Open circuit leakage current
When the output contact is turned off, no current leaks.
*1. 250 V AC or less when the unit does not comply with CE, UL or cUL standards.
*2. UL and cUL standards approved at 120 and 240 V AC.
DC circuit Diode (for commutation)
AC circuit Surge absorber
Load
24 V DC
Fuse
Y000
COM0
Load
100 V DC
Fuse
Y002
Y003
COM2
Main unit