Description
The MTL4850 from Eaton MTL is a 32-channel HART multiplexer that creates a simple interface between smart field devices and host control or asset management systems . It mounts on termination boards or backplanes and communicates via standard RS485, supporting up to 2016 devices on a single network .
This module is distinguished by its SIL3 certification for connection to safety instrumented functions up to SIL3, achieved through non-interfering design that preserves analog loop integrity . Channel-to-channel isolation, auto-baud detection, and onboard diagnostics reduce commissioning time while providing continuous visibility into device health. The MTL4850 supports HART Rev. 5-7 devices and integrates with FDT-based software via downloadable DTM files .
Frequently Asked Questions
Q: Is the MTL4850 still in production?
A: Yes. Unlike the KINCO unit we discussed earlier, the MTL4850 remains an active product in Eaton’s MTL portfolio. It’s been supplemented by newer models like the MTL4851/52/54, but the original MTL4850 is still available for applications requiring its specific form factor and SIL3 certification .
Q: What does “SIL3 certified” actually mean for a multiplexer?
A: Important distinction—the MTL4850 does not perform a safety function itself. It’s certified as “non-interfering” for connection to loops that do perform safety functions up to SIL3 . The design ensures that multiple concurrent faults would be required before the multiplexer could compromise the analog loop’s integrity. You can connect it to safety-related 4-20 mA loops without having to recertify the entire loop.
Q: How many devices can one MTL4850 handle?
A: Each MTL4850 module handles 32 HART devices. You can connect up to 63 modules on a single RS485 network, giving you access to 2016 devices from one host connection point . The Triconix-specific variant (4850-TR) is optimized for Triconex systems but follows the same channel count .
Q: Does it work with my existing HART software?
A: Most likely yes. The MTL4850 supports FDT-based software packages through its Device Type Manager (DTM), which you can download free from MTL’s site . It also works with AMS Device Manager and other packages that include the device description (DD) file. Auto-baud detection means you don’t have to manually configure communication parameters .
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