IC660BBD024 A DC 32-Circuit Source/Sink I/O Block is an intelligent, configurable module that interfaces the controller to devices that provide or accept a binary signal. The blocks are compatible with a wide range of input devices, including both 2-wire and 3-wire electronic proximity switches. Outputs may be low-power control and indicating devices such as relays, contactors, and lamps. Two models are available:
12/24 VDC 32- Circuit Source block (IC66*BBD024), which provides current to the field output devices.
5/12/24 VDC 32-Circuit Sink block (IC66*BBD025), which receives current from field output devices.

IC660BBD024 Features:
Source and Sink versions each operate at nominal 12 to 24 volts DC
Sink version is also +5 volt TTL-compatible
Thirty-two configurable I/O circuits, inputs, and outputs can be mixed ona block
Resettable self-protecting circuits
Software configurable
Advanced diagnostics
These blocks have 32 identical discrete I/O circuits, each easily configured to be an input, an output, or an output with feedback. This flexibility provides maximum design and application efficiency.
Each circuit contains built-in protection when used as an output, protecting the driver while allowing short-time surges. It also protects against shorted loads caused by wiring errors.
Block LEDs verify proper block operation and CPU communications. Individual circuit LEDs on the logic side indicate voltage present on inputs and outputs.
IC660BBD024 Field Wiring:
Terminals 5 to 46 are for field devices. Each terminal accepts one AWG #14 wire (avg 2.1mm2 cross section), two AWG #14 (2.1mm2 cross section) solid wires, or two AWG #16 (each avg 1.3mm2 in cross section) stranded wires.
Any circuit can be an input or output. Connect one terminal of a field device to DC power and the other to the block (terminals 10-41). All I/O devices must return to the same power circuit.
Depending on layout and current loads, positive and negative connections can be bussed and made by single wires to the block or power source.
For a Source block, connect outputs to the negative side of the power supply and inputs to the positive side.

IC660BBD024 Configuration:
First, the block must be configured with a Hand-held Monitor to:
Enter its Device Number (serial bus address).
Enter its Reference Number (required only for IC600 and IC550 series PLCy).
In addition, unless all circuits on the block are inputs, the Block I/O Type must be set to either Outputs or Combination on the Program Block ID screen.