*3 The total load current of resistance loads per common terminal
should be the following value or less.
- 1 output point/common terminal : 2A
- 4 output points/common terminal : 8A
- 8 output points/common terminal : 8A
As for the number of outputs per common terminal, refer to
“Chapter 4 interpretation of partition” and the following
manual.
→ Refer to FX3G Series User's Manual - Hardware Edition.
3.5.2 Life of relay output contact
The product life of relay contacts considerably varies depending on
the load type used. Take care that loads generating reverse
electromotive force or rush current may cause poor contact or
deposition of contacts which may lead to considerable reduction of
the contact product life.
1) Inductive load
Inductive loads generate large reverse electromotive force
between contacts at shutdown may cause arcing. At a fixed
current consumption, as the power factor (phase between current
and voltage) gets smaller, the arc energy gets larger.
The standard life of the contact used for Inductive loads, such as
contactors and solenoid valves, is 500 thousand operations at
20VA.
The following table shows the approximate life of the relay based
on the results of our operation life test.
Test condition: 1 sec. ON / 1 sec.OFF.
The product life of relay contacts becomes considerably shorter
than the above conditions when the rush overcurrent is shut
down.
→ For countermeasures while using inductive loads,
refer to Subsection 3.5.4.
Some types of inductive loads generate rush current 5 to 15 times
the stationary current at activation. Make sure that the rush
current does not exceed the current corresponding to the
maximum specified resistance load.
2) Lamp load
Lamp loads generally generate rush current 10 to 15 times the
stationary current. Make sure that the rush current does not
exceed the current corresponding to the maximum specified
resistance load.
3) Capacitive load
Capacitive loads can generate rush current 20 to 40 times the
stationary current. Make sure that the rush current does not
exceed the current corresponding to the maximum specified
resistance load. Capacitive loads such as capacitors may be
present in electronic circuit loads including inverters.
→ For the maximum specified resistance load,
refer to Subsection 3.5.1.
3.5.3 Example of relay output wiring
3.5.4 Cautions in external wiring
As for the details of Instructions for connecting input devices, refer to
the following manual.
→ Refer to FX
3G Series User's Manual - Hardware Edition.
Protection circuit for load short-circuiting
When a load connected to the output terminal short-circuits, the
printed circuit board may be burnt out. Fit a protective fuse on the
output circuit.
Protection circuit of contact when inductive load is used
An internal protection circuit for the relays is not provided for the
relay output circuit in this product. It is recommended to use
inductive loads with built-in protection circuits. When using loads
without built-in protection circuits, insert an external contact
protection circuit, etc. to reduce noise and extend the product life.
1) DC circuit
Connect a diode in parallel with the load.
Use a diode (for commutation) having the following
specifications.
2) AC circuit
Connect the surge absorber (combined CR components such as
a surge killer and spark killer, etc.) parallel to the load.
Select the rated voltage of the surge absorber suitable to the
output used. Refer to the table below for other specifications.
Interlock
Loads, such as contactors for normal and reverse rotations, that
must not be turned on simultaneously should have an interlock in the
PLC program and an external interlock.
Common mode
Use output contacts of the PLC in the common mode.
Load capacity Contact life
20VA
0.2A/100V AC
3 million times
0.1A/200V AC
35VA
0.35A/100V AC
1 million times
0.17A/200V AC
80VA
0.8A/100V AC
2 hundred thousand times
0.4A/200V AC
Item Standard
Reverse voltage 5 to 10 times the load voltage
Forward current Load current or more
Item Standard
Electrostatic capacity
Approx. 0.1μF
Resistance value Approx. 100 to 200Ω
PLC
DC power
supply
Y0
COM0
Load
Y1
COM1
Load
Fuse
Fuse
AC power
supply
3.6 Transistor output specifications and example of
external wiring
As for the details of the transistor output specifications and external
wiring, refer to the following manual.
→ Refer to FX3G Series User's Manual - Hardware Edition.
3.6.1 Transistor output specifications
*1 Each value inside ( ) indicates the number of occupied points.
*2 The total load current of resistance loads per common terminal
should be the following value or less.
- 4 output points/common terminal : 0.8A
As for the number of outputs per common terminal, refer to
“Chapter 4 interpretation of partition” and the following
manual.
→ Refer to FX3G Series User's Manual - Hardware Edition.
*3 The response time is as follows in the FX2N-8EYT-H
-OFF→ON : 0.2ms or less/1A
-ON→OFF : 0.4ms or less/1A
*4 The total of inductive loads per common terminal should be the
following value or less.
- 1 output point/common terminal : 12W/24V DC
- 4 output points/common terminal : 19.2W/24V DC
As for the number of outputs per common terminal, refer to
“Chapter 4 interpretation of partition” and the following
manual.
→ Refer to FX
3G Series User’s Manual - Hardware Edition.
3.6.2 External Wiring of Transistor Output
1. External Wiring of Sink Output Type
Item Specification
Number
of
output
points
FX3G-14MT
6 points (8 points)
*1
FX2N-8EYT
8 points
FX3G-24MT
10 points (16 points)
*1
FX3G-40MT
,
FX2N-32ET
,
FX2N-16EYT
16 points
FX3G-60MT
,
FX
2N-48ET
24 points
Output connecting type
Refer to FX3G Series
User's Manual
- Hardware Edition
Output
form
FX3G-MT/ES(-A),
FX
3G-MT/DS,
FX
2N-ET,
FX2N-48ET-D,
FX
2N-EYT,
FX2N-8EYT-H
Transistor(Sink)
FX3G-MT/SS
FX2N-ET-ESS/UL,
FX
2N-48ET-DSS,
FX
2N-EYT-ESS/UL
Transistor(Source)
External power supply 5 to 30V DC
Max.
load
Resist
ance
load
FX3G-MT,
FX2N-ET,
FX2N-ET-,
FX
2N-EYT,
FX
2N-EYT-ESS/UL
0.5A/point
*2
FX2N-8EYT-H
1A/point
*3
FX2N-16EYT-C
0.3A/point
*2
Induct
ive
load
FX3G-MT,
FX2N-ET,
FX2N-ET-,
FX
2N-EYT,
FX
2N-EYT-ESS/UL
12W/24V DC
*4
FX2N-8EYT-H
24W/24V DC
*3
FX2N-16EYT-C
7.2W/24V DC
*4
Min. load −
Open circuit leakage current 0.1mA or less/30V DC
ON voltage 1.5V or less
Respon
se time
OFF
→
ON
FX3G-
14MT,
FX3G-
24MT
Y000,
Y001
5μs or less/10mA or more
(5 to 24V DC)
Y002 or
more
0.2ms or less/200mA
or more (at 24V DC)
FX3G-
40MT,
FX3G-
60MT
Y000 to
Y002
5μs or less/10mA or more
(5 to 24V DC)
Y003 or
more
0.2ms or less/200mA
or more (at 24V DC)
Input/output extension
units/blocks
0.2ms or less/200mA
or more (at 24V DC)
ON
→
OFF
FX3G-
14MT,
FX
3G-
24MT
Y000,
Y001
5μs or less/10mA or more
(5 to 24V DC)
Y002 or
more
0.2ms or less/200mA
or more (at 24V DC)
FX3G-
40MT,
FX3G-
60MT
Y000 to
Y002
5μs or less/10mA or more
(5 to 24V DC)
Y003 or
more
0.2ms or less/200mA
or more (at 24V DC)
Input/output extension
units/blocks
0.2ms or less/200mA
or more (at 24V DC)
Circuit insulation Photocoupler insulation
Display of output operation
LED on panel lights when
photocoupler is driven.
Item Specification
DC power
supply
DC power
supply
PLC
Fuse
Y0
COM0
Y1
COM1
Fuse
Load
Load
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