The 6AG1521-1BH50-7AA0 is a 16-channel digital input module for the S7-1200 system, wired as a sourcing input block at 24 V DC. It supports I&M data from level 0 through 3, enabling device identification within an automation network. Fast startup completes in 500 ms, meeting time-sensitive commissioning cycles. Rated signal '1' draws 4.5 mA per channel; input response is symmetrical at 3–4 ms for both transitions. The module delivers channel status via green LEDs and a RUN/ERROR LED pair on the front face. Rated isolation between circuits is 75 V DC/60 V AC, with a type test at 707 V DC. Maximum cable length is 1 000 m shielded, 600 m unshielded. Power draw is 2.8 W typical from the 24 V DC backplane bus. The module can simultaneously source all 16 inputs up to +60 °C; above that, derate to a maximum of 8 simultaneous inputs.
Siemens 6AG1521-1BH50-7AA0 16DI S7-1200, 24V DC, Sourcing
MPN6AG1521-1BH50-7AA0
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Siemens SIMATIC S7-1200 digital input module, 16 channels sinking/sourcing (sourcing type), 24 V DC, I&M0-3, fast startup 500 ms, dimensions 129×35×147 mm.
$212.09Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Number of digital inputs | 16; > +60 °C, number of simultaneously controllable inputs max. 8 |
| 2-wire sensor support | Yes |
| Parameter | Value |
|---|---|
| Rated value (DC) | 24 V |
| Input voltage at signal "1" | -11 to -30V |
| Input voltage at signal "0" | -5 to +30V |
| Permissible range, lower limit (DC) | 19.2 V |
| Permissible range, upper limit (DC) | 28.8 V |
| Input current at signal "1" (typ.) | 4.5 mA |
| Power loss (typ.) | 2.8 W |
| Permissible quiescent current, 2-wire sensor, max. | 1.5 mA |
| Cable length, unshielded, max. | 600 m |
| Cable length, shielded, max. | 1 000 m |
| Parameter | Value |
|---|---|
| Input delay 0 to 1, min. | 3 ms |
| Input delay 1 to 0, min. | 3 ms |
| Input delay 0 to 1, max. | 4 ms |
| Input delay 1 to 0, max. | 4 ms |
| Input delay, parameterizable values | No |
| Parameter | Value |
|---|---|
| Max. ambient temperature, horizontal installation | 70 °C; = Tmax; > +60 °C number of simultaneously controllable inputs max. 8 |
| Parameter | Value |
|---|---|
| Diagnostics function | No |
| Short-circuit (NAMUR sensor) | No |
| Diagnostic alarm | No |
| Hardware interrupt support | No |
| Isolation between channels | No |
| Isolation between channels and backplane bus | Yes |
| Isolation test voltage | 707 V DC (type test) |
| Channels per isolated group | 16 |
| Parameter | Value |
|---|---|
| Depth | 129 mm |
| Height | 147 mm |
| Width | 35 mm |
Product details
Frequently asked questions
Does this module support I&M data?
Yes, it supports I&M data levels 0 through 3.
What is the fast startup time?
Fast startup takes 500 ms.
MPN
6AG1521-1BH50-7AA0