Allen-Bradley 1756-RM2XT Enhanced Redundancy Module
Product Introduction
The 1756-RM2XT belongs to the ControlLogix series. It provides high-availability supervision for redundant chassis setups. Specifically, it manages state transitions and operating modes. This module operates reliably in harsh conditions. Additionally, it meets T4 temperature codes for North America, IECEx, and ATEX. You cannot mix it with older 1756-RM/A, 1756-RM/B, or 1756-RMXT modules.
Technical Specifications
This section covers the key electrical and optical parameters.
The part number is 1756-RM2XT, and the module type is an enhanced redundancy module with extended temperature support. Its current draw reaches 1.16 amperes at 5.1 volts DC and 3.4 milliamperes at 24 volts DC. Maximum power dissipation is rated at 6 watts, while thermal dissipation reaches 21 BTU per hour. The transmission rate stays below 1000 MB per second. It operates on a single channel with a wavelength of 1300 nanometers. Supported fiber cable length goes up to 4 kilometers.
For instance, the low current draw makes this 1756-RM2XT energy-efficient. Meanwhile, the 6-watt dissipation keeps heat manageable in sealed cabinets.
Mechanical and Environmental Data
Here are the physical and environmental ratings.
This module has no enclosure, meaning it is an open-style board. Its dimensions are 5.51 inches in height, 4.41 inches in width, and 5.71 inches in depth. Recommended wire size is 20 AWG. The operating temperature range runs from 32 to 140 degrees Fahrenheit, which equals 0 to 60 degrees Celsius. Compatible controllers include the ControlLogix 5580 and 5570 series. It occupies a single slot in any chassis.
Furthermore, the extended temperature range suits outdoor or high-heat industrial sites. Therefore, the 1756-RM2XT is ideal for oil and gas or mining applications.
Installation Guidelines
Follow these steps for a proper setup.
First, insert one 1756-RM2XT into each of the two chassis. Then, connect them using a Bulletin 1756-RMC series fiber cable. Next, use standard power supplies like the 1756-PAXT or 1756-PBXT. Additionally, ensure both modules have the same firmware revision. Finally, verify the redundant system status via the controller tags.
Do not install this module next to high-voltage devices. Moreover, keep the fiber cable bends gentle to avoid signal loss.
Packaging List
The package includes the following items:
One 1756-RM2XT redundancy module.
One printed quick start guide.
Note: No certificates or warranty documents are included in the box.
Shipping Information
We ship worldwide using FedEx, UPS, or DHL. Orders placed before 2 PM ship same day.
Frequently Asked Questions (FAQ)
Can I use the 1756-RM2XT with a 1756-RM/A module?
No. The 1756-RM2XT only works with other enhanced redundancy modules. It is not compatible with 1756-RM/A, 1756-RM/B, or 1756-RMXT.
Does this module support SIL 2 applications?
Yes. It is interference-free and ideal for ControlLogix SIL 2 safety functions.
What is the maximum fiber cable length allowed?
The module supports up to 4 kilometers using compatible 1300 nanometer wavelength fiber.
Which controllers are compatible with the 1756-RM2XT?
It supports ControlLogix 5580 and 5570 series controllers. It also works with 5560 series.
What power supplies can I use with this module?
You can use standard 1756-PAXT and 1756-PBXT power supplies from the same series.
