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No external power source is required for module operation. Power for the user’s transceivers must be supplied from an external source. Intelligent processing for this module is performed by the CPU or NIU. The module provides 15 words of analog input data. Modules IC200ALG265 and IC200ALG266 are enhanced versions of analog modules IC200ALG263 and IC200ALG264. The IC200ALG265 and IC200ALG266 feature improved overvoltage protection and improved internal diagnostics. In addition, IC200ALG265 and IC200ALG266 are approved by TUV for use in the safety-relevant portion of a GMR system.

Both modules report an Internal Hardware fault upon detection of an A/D conversion malfunction in excess of ±6%. The module detects this malfunction by applying a known stimulus to the A/D conversion path and verifying the expected result. If an unexpected result occurs three times consecutively, the module turns off the OK LED and reports the malfunction to the CPU/NIU. If fault reporting is enabled, the CPU/NIU will generate a Loss of I/O Module fault. The module must be power cycled and/or replaced to clear this fault. Both modules also report a Loss of User Side Power fault for field-side circuits. Module IC200ALG266 also reports an Open Wire fault for individual channels, when configured for 4-20mA mode if Fault Reporting is enabled. If the field common wire is disconnected, the ALG266 module will report at least one open wire fault for one of its 15 channels