User manual

Publication CIG-WD001B-EN-P - May 2005
1762 I/O on MicroLogix 1200 Controllers 9-9
IN 7
IN 5
IN 3
IN 1
DC
COM
IN 6
IN 4
IN 2
IN 0
24V dc
DC
COM
Commons are
connected internally.
+D C (sinking)
-DC (sourcing)
-DC (sinking)
+D C (sourcing)
Sinking/Sourcing Inputs - Sourcing/sinking describes the current flow between the
I/O module and the field device. Sourcing I/O circuits supply (source) current to sinking
field devices. Sinking I/O circuits are driven by a current sourcing field device.
Field devices connected to the negative side (DC Common) of the field power supply
are sinking field devices. Field devices connected to the positive side (+V) of the
field supply are sourcing field devices.
Also, this product is intended to be mounted to a well-grounded mounting surface
such as a metal panel.
Be careful when stripping wires. Wire fragments that fall into a
module could cause damage when power is applied. Once wiring is
complete, ensure the module is free of all metal fragments.
Miswiring of the module to an AC power source will damage
the module.
1762-IQ8
EXC 2
SENSE 2
RTN 2
NC
EXC 2
SENSE 2
RTN 2
NC
Cable Shield (to Ground)
Potentiometer
RTD EXC
Return
Cable Shield (to Ground)
Potentiometer
RTD EXC
Return
Belden 9501 Shielded Cable
Belden 9501 Shielded Cable
TIP:
The potentiometer wiper arm can be connected to either the EXC or return terminal
depending on whether you want increasing or decreasing resistance.
IMPORTANT: Using 2-wire configurations does not permit the module to compensate for
resistance error due to lead wire length. The resulting analog data includes
the effect of this uncompensated lead wire resistance. The module continues
to place the uncompensated analog data in the input data file, but the
open-circuit status bit (OCx) is set in word 4 of the input data file for any
enabled channel using a 2-wire configuration. These status bits may be used
in the control program to indicate that the analog data includes error due to
uncompensated lead wires.
EXC 2
SENSE 2
RTN 2
NC
EXC 2
SENSE 2
RTN 2
NC
Cable Shield (to Ground)
Potentiometer
RTD EXC
Return
Sense
Run RTD and sense wires from the module to
potentiometer terminal and tie terminal to one point.
Cable Shield (to Ground)
Potentiometer
RTD EXC
Return
Sense
Run RTD and sense wires from the module to
potentiometer terminal and tie terminal to one point.
Belden 83503 or 9533 Shielded Cable
Belden 83503 or 9533 Shielded Cable
TIP:
The potentiometer wiper arm can be connected to either the EXC or return terminal
depending on whether you want increasing or decreasing resistance.
1762-IR4 2-Wire Potentiometer Interconnection 1762-IR4 3-Wire Potentiometer Interconnection