YOKOGAWA CP401-11 S1 Processer Module

• AAI141-H Analog Input Module (Current Input) 16-channel, 4 to 20 mA, non-isolated
• AAB141-H Analog Input Module (Voltage/current Input) 16-channel, 1 to 5 V/4 to 20 mA, non-isolated
• AAI841-H Analog I/O Module (Current I/O) 8-channel input/8-channel output, 4 to 20 mA, non-isolated
• AAB842-H Analog I/O Module(Voltage/current Input, Current Output) 8-channel input/8-channel output, 1 to 5 V/4 to 20 mA input, 4 to 20 mA output, non-isolated
• AAI135-H Analog Input Module (Current Input) 8-channel, 4 to 20 mA, isolated channels
• AAI835-H Analog I/O Module (Current I/O) 4-channel input/4-channel output, 4 to 20 mA, isolated channels
• AAI143-H Analog Input Module (Current Input) 16-channel, 4 to 20 mA, isolated
• AAI543-H Analog Output Module (Current Output) 16-channel, 4 to 20 mA, isolated

Each processor module has two MPU. MPU1 and MPU2 mounted on each module perform same control computations and the results are compared by a comparator for each calculation. When the results of both MPU are same, the module is assumed to be normal and the results are transmitted to main memory devices and bus interface modules. The main memory devices with ECC (error-correcting code) correct transient reversed-bit errors. 

• If the results from MPU1 and MPU2 are not same the comparator assumes it “calculation abnormal”, the active processor module is switched to another one. 

• Watch Dog Timer detects abnormal functions of active processor module. In case abnormal functions are detected, active processor module would be switched to another processor module. 

• The standby processor module performing the same computations as the active module, switching to active status without interruption is possible. 

• The processor module with calculation error performs self-diagnosis; if the hardware is not assumed abnormal, the error is assumed transient and the module status recovers from “abnormal” to “standby”

 • Vnet/IP interface is an interface available for dual-redundancy mounted on CPU and connected to a dual-redundant control bus.

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