The 6AG1221-1BF30-2XB0 is a Siemens SIPLUS digital input module from the ET 200SP family. It gives you 8 electrically isolated inputs, each rated for 24 V DC with a permissible range of 20.4 to 28.8 V. What sets the SIPLUS variant apart is the operating span of -40 to 70 °C — that puts it into cold storage, outdoor cabinets, or near ovens where a standard ET 200SP module would be outside its comfort zone. Expect diagnostic alarms (per-channel and module-level), plus status indication for each input. The module is parameterizable, letting you filter debounce times and set the input delay. It needs a front connector (sold separately) and draws 1.5 W typical from the backplane bus (5 V DC, max 105 mA).
Siemens 6AG1221-1BF30-2XB0 SIPLUS DI Module, 8 DI, -40..70°C
MPN6AG1221-1BF30-2XB0
Siemens SIPLUS 6AG1221-1BF30-2XB0, 8-channel digital input module, 24 V DC, -40 to 70 °C, IP20, with diagnostic alarm.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Number of digital inputs | 8 |
| Max. inputs, up to 40 °C | 8 |
| Parameter | Value |
|---|---|
| Rated value (DC) | 24 V |
| Input voltage at signal "1" | 15 V DC at 2.5 mA |
| Input voltage at signal "0" | 5 V DC at 1 mA |
| Permissible range, lower limit (DC) | 20.4 V |
| Permissible range, upper limit (DC) | 28.8 V |
| Input current at signal "1" (typ.) | 4 mA |
| Input current at signal "0", max. (permissible quiescent current) | 1 mA |
| Power loss (typ.) | 1.5 W |
| Current consumption from backplane bus (5 V DC), max. | 105 mA |
| Cable length, unshielded, max. | 300 m |
| Cable length, shielded, max. | 500 m |
| Parameter | Value |
|---|---|
| Input delay, parameterizable values | Yes |
| Parameter | Value |
|---|---|
| Diagnostics function | Yes |
| Diagnostic alarm | Yes |
| Channels per isolated group | 2 |
| Parameter | Value |
|---|---|
| Depth | 75 mm |
| Height | 100 mm |
| Width | 45 mm |
Product details
Frequently asked questions
What temperature range does this module cover?
It operates from -40 °C up to 70 °C, with the permissible supply voltage range of 20.4 to 28.8 V DC.
Will the 6AG1221-1BF30-2XB0 drop into a panel designed around a 6AG1223-1BL32-4XB0?
Not without rewiring and reconfiguration. The 6AG1221-1BF30-2XB0 is a pure digital input module (8 DI), while the 6AG1223-1BL32-4XB0 is a combined I/O module (typically mixed digital inputs and outputs). Footprint, terminal assignments, and configuration differ.
What compliance/certification does this module carry?
CE mark and FM approval are listed. It carries IP20 protection. No explicit UL or RoHS/REACH declaration appears in this entry; the CE mark implies compliance with applicable EU directives. Verification for specific project requirements is recommended.
MPN
6AG1221-1BF30-2XB0