AddFEM

The various signal types with AddFEM are distributed across the process connections in such a way that a single module is often sufficient for small applications. Applications with a large quantity framework can be implemented by using several modules.

The measuring ranges of the analog inputs and outputs are designed so that no additional signal transducers have to be used. By means of an additional current range of ± 50 mA for the analog outputs, actuators with higher power requirements, e.g. fuel control valves, can also be controlled without additional signal amplifiers.

AddFEM SoE (Sequence of Event) with a preprocessing Front End Function (FEF)

The Front End Module AddFEM SoE is tailored to the special applications in power plant and process control technology where exact time tagging is required when recording changes in signals, e.g. for archiving the statuses of a power plant for analysis of incidents or for general logging.

The AddFEM is synchronized by the GPS time server, and tags the binary signals with an accuracy of 1 ms.

The integrated redundancy in 3 levels and the fast, stand-alone switching over guarantee high availability. The module communicates with the automation system over the redundant PROFIBUS DP.

The AddFEM SoE requires the AddFEM SoE repeater module for on-site signal distribution, adaptation of the medium (glass FOC to plastic FOC) and signal inversion.

AddFEM SoE repeater module

The SoE repeater module can be extended by up to 5 SoE repeater extension modules, and forms a unit together with these.

Since the SoE repeater module can be cascaded, up to 5 of such units can be connected in series.

SoE repeater module and SoE repeater extension module have no intelligence whatsoever. The logic of the input signal is inverted without changing its timing and connected to the outputs.

Up to 6 AddFEM SoE modules can be connected via plastic FOCs to each module. The service interface X1 present on the AddFEM SoE (see graphic) is used as the signal input.

Large distances have to be covered between the GPS time server and the AddFEM SoE. Therefore glass FOCs are used as the transmission medium between the GPS time server and the SoE repeater module.

SoE repeater module, SoE repeater extension module and AddFEM SoE are mounted together in the electronics cabinet. The SoE repeaters are mounted on a rail TH 35 – 7.5 EN 60 715 or TH 35 – 15 EN 60 715.

The SoE repeater module is powered with 24 V DC. It supplies the SoE repeater extension module of the unit via a rail bus connector.