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Ethernet-compliant new generation Ex-Remote HMIs

09 December 2009

R. Stahl HMI Systems has launched robust Remote HMI stations for installation in rough industrial environments as well as hazardous areas of zones 1, 2, 21, and 22. The ET/MT-5x6 series with 15" or 19" touch screens enables users to operate PCs in safe areas from field stations in many different ways.

Ethernet-compliant new generation Ex-Remote HMIs
Ethernet-compliant new generation Ex-Remote HMIs

For example, the HMIs can be used as Thin Clients to communicate with host computers directly via the Ethernet using the RDP or VNC protocol. Alternatively, the HMIs can be coupled via a KVM box, which is the usual route.

With the KVM box, the Remote HMIs are also connected via TP or optical fibre Ethernet cables, which make communication flexible. While simple one-to-one allocation of Ex stations and PCs in the safe area remain possible, many other options are also available. Similarly, a single Remote HMI can access alternating servers. It is also possible to implement a multi-monitor field station connected to several graphics cards of the same PC. No parameterising is necessary for coupling a station to a PC using digital interfaces via the KVM box. Otherwise settings are entered via a screen dialog. The systems feature IP66 front protection and can withstand extreme ambient temperatures ranging from -20 °C to +55 °C. By adding a heater and front protection plate, this increases to -40 °C to +55 °C. The stations also do not require a special housing for use within hazardous areas.

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