FX3G INSTALLATION MANUAL
11
When lead switches with a series LED are used, up to two switches
can be connected in series. Also make sure that the input current is
over the input-sensing level while the switches are ON.
3. In the case of input device with built-in parallel resistance:
Use a device with a parallel resistance of 15kΩ or more. When the
resistance is less than 15kΩ, connect a bleeder resistance.
4. In the case of 2-wire proximity switch:
Use a two-wire proximity switch whose leakage current is 1.5mA
or less when the switch is off. When the current is 1.5mA or more,
connect a bleeder resistance.
4.5 PULSE CATCH (M8170 TO M8175)
The PLC (main unit) is provided with a pulse catch function and has 6
pulse catch input points.
For details on programming, refer to the HELP section in GX Works2.
n CAUTIONS FOR PULSE CATCH
1. Non-overlap of input numbers
The input terminals X000 to X005 can be used for high-speed
counter, input interruption, pulse catch, speed detection (SPD)
instructions and general-purpose input.
Take care not to overlap the input numbers.
2. Cautions in wiring
It is recommended to use shielded twisted-pair cables for connection
cables.
n EXAMPLES OF EXTERNAL WIRING
It is recommended to use shielded twisted-pair cables for connection
cables. Ground the shield of each shielded cable only on the PLC side.
n EXAMPLES OF PULSE CATCH (M8170) WIRING USING X000
When another input terminal is used, wire it according to the following
diagrams.
1) When 24VDC service power supply is used
2) When 24VDC external power supply is used
4.6 PULSE WIDTH/PULSE PERIOD MEASUREMENT
SPECIFICATIONS AND WIRING
Four input points in the PLC (main unit) can be used for the pulse
width/period measurement function which enables measurement of the
pulse width or pulse frequency in units of 10 s.
For details on programming, refer to the HELP section in GX Works2.
n CAUTIONS FOR PULSE WIDTH/PERIOD
MEASUREMENT FUNCTION
1. Non-overlap of input numbers
The input terminals X000, X001, X003 and X004 can be used for
high-speed counter, input interruption, pulse catch, speed detection
(SPD) instructions and general-purpose input. Take care not to
overlap the input numbers. However, overlap of input numbers is
allowed for input interruptions.
2. When the pulse width/period measurement function and high-speed
counters are used together, the overall frequency of high-speed
counters is affected.
3. Make sure that the total frequency of four input channels is 50
kHz or less when using the pulse width/period measurement
function. For details on programming, refer to the HELP section in
GX Works2.
4. Cautions in wiring
It is recommended to use shielded twisted-pair cables for connection
cables.
n EXAMPLES OF EXTERNAL WIRING
It is recommended to use shielded twisted-pair cables for connection
cables. Ground the shield of each shielded cable only on the PLC side.
n EXAMPLES OF PULSE WIDTH MEASUREMENT WIRING
USING X000
When another input terminal is used, wire it according to the following
diagrams.
1) When 24V DC service power supply is used
2) When 24V DC external power supply is used
S/S
L
N
24V
Class D grounding *
Fuse
Sink wiring
0V
X000
Three-wire
S/S
L
N
24V
Fuse
Source wiring
0V
X000
Three-
wire
* The grounding resistance should be 100Ω or less.
Class D grounding *
S/S
L
N
24V
Fuse
24V DC
Sink wiring
0V
X000
S/S
L
N
24V
Fuse
24V DC
Source wiring
0V
X000
Three-
wire
Three-wire
* gnidnuorg D ssalC* gnidnuorg D ssalC
* The grounding resistance should be 100 or less.
S/S
L
N
24V
Class D grounding *
Fuse
Sink wiring
0V
X000
Three-wire
S/S
L
N
24V
Fuse
Source wiring
0V
X000
Three-
wire
* The grounding resistance should be 100Ω or less.
Class D grounding *
S/S
L
N
24V
Fuse
24V DC
Sink wiring
0V
X000
S/S
L
N
24V
Fuse
24V DC
Source wiring
0V
X000
Three-
wire
Three-wire
* gnidnuorg D ssalC* gnidnuorg D ssalC
* The grounding resistance should be 100 or less.
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