Compared to the standard CPU
The base CPU 6ES7151-8AB00-0AB0 shares the identical form, function, and wiring. The 6AG1 adds conformal coating and extended temperature range (-25…+70°C).

Siemens SIPLUS ET 200S IM 151-8 PN/DP CPU, conformal coated, -25…+70°C, spare part 6AG1151-8AB00-7AB0.
The base CPU 6ES7151-8AB00-0AB0 shares the identical form, function, and wiring. The 6AG1 adds conformal coating and extended temperature range (-25…+70°C).
The standard equivalent is 6ES7151-8AB00-0AB0, which lacks conformal coating and the -25°C lower limit.
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