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Rockwell Automation Publication 1718-IN001A-EN-E - June 2020
1718 Ex I/O
2.
In order to code the terminal to match the front socket, cut off the
plastic lugs from the terminal from those points where coding pins are
located in the front socket.
Note that the coding in example 1 and example 2 is not unique. The terminal
from example 1 could be accidentally connected to the front socket in example
2. In contrast, the coding in example 1 and example 3 is unique.
Line Fault Detection
Most I/O modules have a line fault detection function that can recognize a lead
breakage or a short circuit.
• 1719-IBN8B or 1719-IBN8 digital input module If the input is used,
for example, with a mechanical contact, an additional resistor circuit
must be installed to ensure that the line fault detection function can
work correctly. Using the additional resistor circuit, the electronics can
distinguish between a closed switch and a short circuit.
• 1719-IJ frequency counter module If the input is used for direction
detection, the input must be connected to a resistor circuit. The rotation
direction input is ignored for devices without rotation direction
detection.
Coding Examples
Example 1
Example 2
Example 3
Terminal
Front socket
2.2 KΩ
10 KΩ
