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Description The analog input module SAI-1620m has sixteen analog inputs (0—4 V) and an external voltage readback input (0—4 V). The sixteen channels are safe (safety class SIL3, in compliance with IEC 61508) and have an isolated analog 0 V common to all sixteen channels. The field signals for the analog inputs of the SAI-1620m module need to be converted from 0—20 mA to a level suitable for the SAI-1620m module. You can perform this conversion in two ways: • On the field termination assembly module TSAI-1620m, TSHART-1620m, TSGAS-1624 or TSFIRE-1624 • Analog input conversion module BSAI-1620mE, located on programming connector (Px) on the back of the IO backplane in the 19-inch chassis. Analog input signals, such as thermocouple or PT-100, can only be used after conversion to 0(4)—20 mA with a dedicated converter (and an TSAI-1620m or BSAI-1620mE module).