FP2 Analog Unit
Wiring
3 - 6
3.2
Wiring for Analog Input
3.2.4
R.T.D. (Resistance thermometer device) Input (Pt100, Pt1000)
V n
COM
I n
There is no ground terminal
on the analog input units
Ch n
Input terminals
Three-wire R.T.D.
(Resistance thermometer device)
3.2.5
Precautions Regarding Analog Input Wiring
For the wiring of “sections 3.2.1 and 3.2.2” ranges, always use double-core twisted-pair
shielded wires.
Ground the shielding of the shielded wires by connecting them to the ground terminal
at the analog input terminal block (for CPU unit with analog I/O), or to the frame ground
at the control panel.
The analog input terminal block’s grounding terminal of the CPU unit with analog I/O is
connected to the FP2 power supply unit’s grounding terminal inside the FP2.
For the current input of “section 3.2.2”, connect terminals V and I.
For the thermocouple input of “section 3.2.3”, perform the wiring correctly according to
the polarity of the thermocouple. Also, to lengthen the signal wire of the thermocouple,
use the compensating wire of the thermocouple.
For copper wiring used in wiring the R.T.D. (resistance thermometer device) in “section
3.2.4”, use insulated wiring, and wiring with a nominal cross-section of 1.25mm
2
(or
equivalent) to not allow a large build-up in electrical resistance.
Do not have the analog input wiring close to AC wires, power wires, or load wires from
sources other than the PLC.
The terminals marked with a dot on the input and output terminal blocks are not to be
used. However, they may be connected to circuits internally, so be sure not to connect
any wiring to them.
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