YOKOGAWA AAI543-S03 Output Module

These analog I/O modules function as signal converters; by inputting field analog signals into these modules,it converts them to internal data for field control stations (FCS), or the FCS’s internal data to analog signals for outputs.

AAI543 Analog Output Module is a 16 channels isolated Analog Output Module can be installed on Field Control Unit or ESB bus node unit for 4 to 20mA Current Output signals from Field Control Unit to field control devices. Two pieces AAI543 connected to one piece of AEA4D in marshalling side because AEA4D supports 2*16 channels.

The processor modules, power supplies, and I/O modules, including the communication bus, support a redundant configuration. The robustness of the FCS comes from this configuration known as “Pair and Spare” and the reliability of calculation results is guaranteed through real-time validation. Two processor modules have two MPUs each. MPU 1 and MPU 2 in the primary processor module are always comparing the calculation result, and if the results do not match, the first processor module goes into maintenance mode while the secondary processor module takes over process control. 

In order to make this switch over seamless, MPU 3 and MPU 4 are also calculating and comparing the results while the primary processor module is active. Pair and Spare is Yokogawa’s unique technology, supporting impressive levels of availability for CENTUM and ProSafe-RS. This architecture has been approved by TÜV Rheinland for safety instrumented systems. The ProSafe-RS certification was granted to Yokogawa in exceptionally short period of time.

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