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The Siemens 6ES7551-1AB00-0AB0 is the original TM PosInput 2 article for two-channel encoder acquisition in SIMATIC S7-1500 applications.
Engineering review should identify the encoder type on each channel, the associated digital points, project integration, and wiring that must be retained.
Siemens identifies 6ES7551-1AB01-0AB0 as the successor. Compatibility and recommissioning requirements must be verified before migration.
Verified resources for Siemens 6ES7551-1AB00-0AB0:
Siemens 6ES7551-1AB00-0AB0 SIMATIC S7-1500 TM PosInput 2 Specs
Encoder Matching
Position Capture
PosInput Migration





