Rockwell Automation 1769-L23E-QB1B_L23E-QBFC1B_L23-QBFC1B CompactLogix Packaged Controllers Quick Start and User Manual - Manual (Page 194)

194 Publication IASIMP-QS010B-EN-P - October 2009
Chapter 3 Embedded I/O
Digital Inputs Each of the 1769-L23 and 1769-L23E packaged controllers provides 16 DC
sink/source high-speed inputs. This section describes how to wire and
configure the DC inputs.
DC Input Wiring
This diagram shows wiring for the DC input points
(1)
of the packaged
controller.
(1) Sinking/Sourcing Inputs - Sourcing/sinking describes the current flow between the I/O 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. Europe: DC sinking input and sourcing output circuits are the commonly used options.
ATTENTION
Miswiring of the inputs to an AC power source will damage
the embedded inputs.
Be careful when stripping wires. Wire fragments that fall into
a wiring terminal could cause damage at powerup. Once
wiring is complete, make sure the terminal is free of all metal
fragments.
+ DC (sinking)
- DC (sourcing)
24V DC
+ DC (sinking)
- DC (sourcing)
- DC (sinking)
+ DC (sourcing)
- DC (sinking)
+ DC (sourcing)
+ DC (sinking)
- DC (sourcing)
24V DC