Siemens SM 321, 6ES7321-1FF00-0AA0, 8-channel digital input module, AC 120/230 V, optically isolated, for S7-300 rack.
| Parameter | Value |
|---|---|
| Weight | 0.12 kgs |
The Siemens 6ES7321-1FF00-0AA0 is an SM 321 digital input module providing 8 optically isolated channels rated for AC 120/230 V. Each channel accepts line-voltage AC signals directly — no external step-down transformer or interposing relay needed for 120 V or 230 V control circuits.
The module mounts onto a DIN rail and connects to the rack backplane via the standard bus connector.
No official Siemens successor order code is recorded for the 6ES7321-1FF00-0AA0. For a like-for-like replacement, the later variant 6ES7321-1FF10-0AA0 (8×AC 120/230 V, optically isolated) is the closest functional match, but verify bus compatibility with your S7-300 CPU firmware revision before ordering.
Yes, the 6ES7321-1FF00-0AA0 is an SM 321 module designed for the Siemens S7-300 programmable logic controller family. It mounts on the S7-300 DIN rail and communicates over the standard backplane bus.
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