Skip to main content
Log in
Siemens 6AG1521-1BL00-7AB0 — Digital Input Modules

Siemens 6AG1521-1BL00-7AB0 SIPLUS SM 1221 DI 32, 35mm

MPN6AG1521-1BL00-7AB0
Active

Siemens SIPLUS SM 1221, 6AG1521-1BL00-7AB0, 32 x 24 V DC digital input module, 35 mm width, active production.

$393.70Ref. price · indicative, final on quote
Siemens 6AG1521-1BL00-7AB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6AG1521-1BL00-7AB0 — Inputs
ParameterValue
Number of digital inputs32; > +60 °C, number of simultaneously controllable inputs max. 16
2-wire sensor supportYes
6AG1521-1BL00-7AB0 — Electrical
ParameterValue
Rated value (DC)24 V
Input voltage at signal "1"+11 to +30V
Input voltage at signal "0"-30 to +5 V
Permissible range, lower limit (DC)19.2 V
Permissible range, upper limit (DC)28.8 V
Input current at signal "1" (typ.)2.5 mA
Power loss (typ.)4.2 W
Permissible quiescent current, 2-wire sensor, max.1.5 mA
Cable length, unshielded, max.600 m
Cable length, shielded, max.1 000 m
6AG1521-1BL00-7AB0 — Timing
ParameterValue
Input delay 0 to 1, min.0.05 ms
Input delay 1 to 0, min.0.05 ms
Input delay 0 to 1, max.20 ms
Input delay 1 to 0, max.20 ms
Input delay, parameterizable valuesYes
6AG1521-1BL00-7AB0 — Environmental
ParameterValue
Max. ambient temperature, horizontal installation70 °C; = Tmax; > +60 °C number of simultaneously controllable inputs max. 16
6AG1521-1BL00-7AB0 — Diagnostics & Isolation
ParameterValue
Diagnostics functionYes
Short-circuit (NAMUR sensor)No
Diagnostic alarmYes
Hardware interrupt supportYes
Isolation between channelsYes
Isolation between channels and backplane busYes
Isolation test voltage707 V DC (type test)
Channels per isolated group16
6AG1521-1BL00-7AB0 — Mechanical
ParameterValue
Depth129 mm
Height147 mm
Width35 mm

Product details

Input module for warm-panel density

The Siemens SIPLUS 6AG1521-1BL00-7AB0 is a 32-channel digital input module for the S7-1200 system, handling 24 V DC sink/source signals. The key limitation: above +60 °C ambient, only 16 inputs can be switched simultaneously – plan your input count per slot if the panel runs hot. Power draw is 4.2 W typical, and the module isolates between channels at 75 V DC/60 V AC base isolation.

35 mm wide, 129 mm deep, 147 mm tall – it fits standard S7-1200 mounting rails with one module width. Unshielded cable runs up to 600 m; shielded up to 1 000 m. The input threshold for signal 1 is +11 to +30 V at a typical 2.5 mA per channel. Diagnostic alarms and hardware interrupts are parameterizable, with firmware V1.0.0.

Pure input vs. combination module

The 6AG1521-1BL00-7AB0 is a pure 32-channel input block. Compared to the SIPLUS 6AG1123-2DB03-2AX0 (16 digital inputs + 16 digital outputs), this module delivers double the input capacity per slot and fewer wiring terminals on the output side. Choose this when your BOM needs input density and you already have output coverage elsewhere.

Frequently asked questions

What are the key specifications of this module?

32 digital inputs, 24 V DC, rated for sink/source (P-reading). Width 35 mm, depth 129 mm, height 147 mm. Power loss typ. 4.2 W, max current consumption 40 mA. Input delay configurable from 0.05 ms to 20 ms.

Does the module have diagnostic capabilities?

Yes, it features a diagnostic alarm, wire-break detection (I < 350 µA), channel status display per input (green LED), and both module and channel diagnostics (red LEDs).

MPN
6AG1521-1BL00-7AB0