12 Rockwell Automation Publication 1719-IN001D-EN-E - November 2020
1719 Ex I/O Installation Instructions
Coding Connections
1. To code the front socket of an I/O module, insert one or more coding pins into the corresponding grooves on the front socket.
2. 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.
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.
The line fault detection function of the analog I/O modules is based on a current measurement. An additional resistor circuit is not required.
Line fault detection can be enabled or disabled by checking or clearing the Enable Diagnostics checkbox in the Add-on Profile respectively. Status will only be shown on the
module LED.
For more information, see the Add-on Profile help topic for the module.
Cold Junctions in Thermocouples
The 1719-IT4B I/O module is equipped with an internal cold junction. However, it can be used with an external cold junction. Using the Add-on Profile, you can set the cold
junction compensation mode to either Local (internal) or Remote (external).
For more information, see the Add-on Profile help topic for the 1719-IT4B module.
Wire Resistance in Resistance Thermometers
If you operate the 1719-IR4B I/O module in a 2-wire configuration, the wire resistance amounts to that of a resistor that is connected in series to the sensor and affects the
measurement result. To avoid measurement errors, the wire resistance must be measured and compensated for in this configuration. Two options are available here:
ATTENTION: Danger of incorrect connections
If the coding is not unique, terminals can be accidentally swapped.
Establish a unique coding so that every terminal fits exactly one front socket.
Example 1 Example 2 Example 3
Terminal
Front socket
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