MPN: 6ES7 321-1BH02-0AA0 — industrial control spare part, in stock at TGK Parts.
The SM321 1BH02 is the standard 16-channel 24 VDC digital input module for S7-300 racks — the most widely installed DI module in the S7-300 installed base. Field wiring mistakes (AC landed on DC inputs) and opto-isolator aging are the typical failure paths, which is why point-by-point testing is mandatory for used units.
Every module is tested on all 16 channels with diagnostic and interrupt functions verified where fitted.
| MPN | 6ES7 321-1BH02-0AA0 |
|---|---|
| Type | Digital input module |
| Channels | 16 × 24 VDC |
| System | SIMATIC S7-300 |
| Features | Diagnostic / interrupt capable |
| Condition | New / tested used |
| Warranty | 12 months |
Replacement and spare part for industrial automation equipment — production lines, CNC machines, packaging machinery, textile machinery, printing equipment and more.
Usually a shorted opto-isolator from field overvoltage. All 16 channels are tested before shipping.
Check the channel count and voltage — -1BL00 is 32 channels; wiring and config differ.
Yes — on diagnostic-capable revisions the interrupt and diagnostic bits are verified on the bench.