Specifications

87 Publication 1794-SG002D-EN-P - May 2012
Section 2.3
Select FLEX Ex I/O Modules
Step 2 – Select:
I/O modules based on field devices
FLEX Ex follows a producer/consumer model for remote I/O. Input modules
produce data for the system. Controllers, output modules, and intelligent
modules produce and consume data. The producer/consumer model multicasts
data. This means that multiple nodes can consume the same data at the same time
from a single device.
FLEX Ex I/O modules offer 2 through 16 I/O each. You can connect together a
maximum of eight FLEX Ex I/O modules with a FLEX Ex I/O adapter, for a
maximum of 128 I/O per assembly.
Mix and match digital and analog I/O to meet your application needs.
Digital I/O Modules
Digital I/O modules have digital I/O circuits that interface to on/off sensors
(pushbuttons and limit switches) and actuators (motor starters, pilot lights, and
annunciators).
These outputs are controlled by the PLC controller while the inputs control the
state of corresponding bits in the PLC.
Features
• Modules detect, indicate, and report the following faults:
– open input or output field devices or wiring
– shorted output field devices
– shorted input or output wiring
– Selectable input filter times from less than 1 to 33 ms.
• LED for each channel indicating status of:
–corresponding input device
–output signal
Digital I/O Module Summary
Catalog Number Inputs Outputs Terminal Base Unit Electrical Range Module Type
Input Modules
1797-IBN16 16 — 1797-TB3, 1797-TB3S — Nonisolated NAMUR inputs
Output Modules
1797-OB4D — 4 1797-TB3, 1797-TB3S — Nonisolated source outputs