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MTL4850 HART® multiplexers two-way communications channel

The MTL4850 HART multiplexer is used to create a two-way communications channel between numerous items of HART-enabled field equipment and a plant asset-monitoring/control system. Each multiplexer module can incorporate the HART data for up to 32 field channels into a single RS485 signal for onward linking to PC based instrument management software, thereby simplifying the wiring and reducing the cost-per-channel.

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Essential details：MTL4850 HART® multiplexers two-way communications channel

The MTL4850 HART multiplexer is used to create a two-way communications channel between numerous items of HART-enabled field equipment and a plant asset-monitoring/control system. Each multiplexer module can incorporate the HART data for up to 32 field channels into a single RS485 signal for onward linking to PC based instrument management software, thereby simplifying the wiring and reducing the cost-per-channel.
The MTL4850 combines the functions of a HART modem, a power supply conditioner and all the necessary signal-switching and addressing circuitry to multiplex the HART data. It provides a compact, convenient and costeffective building block that can incorporated easily into both new and existing installations, especially as a partner for Eaton’s MTL4500 range of intrinsic safety interfaces. It is the modern version of our popular MTL4840 range and further simplifies the system.

The MTL4850 multiplexer enables the user to gain access to valuable HART data provided by modern field devices in addition to the conventional 4/20mA loop signal provided by them. Many early process installation projects around the world did not take advantage of the data from HART-capable devices at start-up, so the MTL4850 offers a simple upgrade path to that data for asset management as well as the obvious live status and configuration information of the field devices.
Most distributed control systems (DCS) now on the market incorporate the ability to pass HART communications information on the analogue input and output channels, but many safety systems (SIS and F&G) do not. Increasingly therefore, one of the main uses for the HART multiplexer is to provide HART communications for the field instruments connected to safety systems. In such implementations, it is crucial that the HART multiplexer does not interfere with the analogue loops of the safety system.

MTL4850 

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MTL4850 HART® multiplexers two-way communications channel

There are two versions of the product which are essentially the same but the modules differ in mounting in the following way:
– MTL4850 is the general purpose Eaton product supplied in a blue enclosure
– MTL4850-TR is supplied solely to Invensys (Triconex) in a black enclosure.
Physically and electrically the products are the same but may contain different revision levels of the operating firmware. There is no difference between the products in regard to their application for functional safety.
The functional safety assessment applies to MTL4850 with revision status 03 onwards and firmware version 1.02 onwards, as denoted on the product side label.

The MTL4850 multiplexer may be used as part of an asset management system connecting to instrument signal loops that form part of a Safety Instrumented System up to SIL3. In general, the structure of such a system is illustrated below.

The HART multiplexer system provides access to the HART data in the field devices alongside the conventional 4/20mA loops connecting them to the control or instrumentation system. “Capacitive isolation” is used to pick off the HART data from each ‘leg’ of the field signals. This ensures that the integrity of each channel connection is unaffected by a component failure in another channel. As the multiplexer provides a common bridge for the thirty-two channels that are connected to it, the importance of this signal separation may be readily understood. This is particularly important when the multiplexer is associated with signal loops that are feeding a safety shutdown system. It is critical that the integrity of the analogue loops for the safety system is unaffected by any possible failures within the multiplexer.

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