Isolated eight-channel AC digital input module for 120/230 V field signals in S7-300 installations.
Complete order number
6ES7321-1FF01-0AA0
Siemens 6ES7321-1FF01-0AA0 is a SIMATIC S7-300 SM 321 digital input module with eight isolated AC inputs for 120/230 V signals and a 20-pole front connector interface.
The channels are electrically isolated in groups of two and support switches or suitable AC proximity devices. Replacement work should verify the full suffix, hazardous voltage practices, front-connector wiring and station configuration.
| Manufacturer | Siemens |
| Complete part number | 6ES7321-1FF01-0AA0 |
| Product family | SIMATIC S7-300 |
| Official designation | SM 321 digital input module |
| Input configuration | 8 DI; 120/230 V AC; 20-pole |
| Lifecycle wording | Product Cancellation; effective 2024-10-01 |
| Load voltage | 120/230 V AC; 47 to 63 Hz |
| Backplane current at 5 V DC | 29 mA maximum |
| Power loss, typical | 4.9 W |
| Number of digital inputs | 8 |
| Signal 0 voltage range | 0 V to 40 V |
| Signal 1 voltage range | 79 V to 264 V |
| Input delay | 25 ms maximum |
Reads 120/230 V AC on/off signals from switches and control contacts.
Supports maintenance of installed stations using the exact SM 321 configuration.
Enables like-for-like replacement where the 20-pole wiring and channel grouping match.
It is a Siemens SIMATIC S7-300 SM 321 AC digital input module.
The module provides eight isolated digital inputs for 120/230 V AC signals.
The module uses a 20-pole front connector, which should be checked separately for condition and wiring.
No. The input voltage and electrical characteristics are different and require model-specific engineering.
Provide the module label, rack or ET 200M station details, front-connector reference, quantity and destination.
Send the installed module label and station configuration for identification, availability and compatibility review.
Email: sales6@apterpower.com WhatsApp: +86 18159889985
Identification, AC-input review and procurement support for legacy SIMATIC S7-300 signal modules.
We compare the complete SM 321 suffix, eight-input configuration and 120/230 V AC rating before quotation.
Station fit, 20-pole connector, high-voltage wiring, channel grouping and protection are reviewed.
Availability, inspection options, warranty scope, packing and global delivery are confirmed with the offer.
Provide 6ES7321-1FF01-0AA0, clear label photos, rack or ET 200M reference, front connector, quantity and destination.
Confirm eight AC inputs at 120/230 V and the 20-pole interface. A 24 V DC SM 321 is not an equivalent replacement.
Contact us for exact identification, condition requirements, compatibility checks, warranty information and worldwide shipping.
Email: sales6@apterpower.com WhatsApp: +86 18159889985
Additional industrial automation model references for procurement review.
| T0-3-8007/E | XB4BA42 | 109838000 | HLG-320H-48A | MTL3045 |
| 1868-00.500 | TX2300 | 1014K60-1739-01 | 281007300300 | MHFP012DKS |
| MCP250M | 1SVR427071R0000 | 60-1471-13 | DT70-F002E | KFD2-ST2-Ex1.LB |
| SDX-135Z-433 | Z960 | CK80 | 1791DS-IB12 | 0-073-0291 |
| LD28-F1-3974/76a/112 | JCB-PS10 | T8424D1016 | 950MAA034NN | QFA3160 |
| HLG-320H-48 | MPSR2-SHTW-GE | RGMC-111GPB | CLIOLR824A | L4064B2228 |
| L4029E1227 | F1892CCD600 | 077692L | TS-3106-CI-00-AA | 3TH2031-0JB4 |
| 3BA23197BAED4045B | DMC-4KZ-HD | 3BA23197BAED | 6GK5216-0BA00-2AA3 | PCB00259-00 |
| SXWDOC8XX10001 | 7MF1575-8AA | TR-MG/500cc | FX-PCX3711-0 | 6ES7322-1BH01-0AA0 |
| PQ3541 | FP-524C | L5504AUX | 9165/16-11-11 | PCR-10 |
| V24217-B3000-A100 | KCD2-SR-EX1.LB | MTL4015 | ABE7H16R21 | MUS3A-R000SG-01 |
| CWSO-RR-W1 | 3RT1044-1AC20 | HLS-SE20J | 3RT2027-1AL20 | TSXDSY16R5 |
| AT-HDVS-150-RX | DPIL/10 | SZR-MY4-N1 | AT-PA100-G2 | M200E-SMB |
| 6ES7153-1AA03-0XB0 | IC693ALG390G | R4410-WT | VBA-2E-G10-ZAL-1M-2V31-G | BMDPCB95 |
Send the complete model number and quantity for supply verification, compatibility checks, warranty details and worldwide delivery.
Email: sales6@apterpower.com WhatsApp: +86 18159889985
