Skip to main content
Log in
Siemens 6AG1221-1BH30-4XB0 — PLC I/O & Expansion Modules

Siemens 6AG1221-1BH30-4XB0 16DI 24VDC, -40..70°C

MPN6AG1221-1BH30-4XB0

Siemens S7-1200 digital input module, 16 inputs 24 V DC, diagnostics, -40..70 °C, IP20, active lifecycle.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

6AG1221-1BH30-4XB0 — I/O
ParameterValue
Digital inputs16
6AG1221-1BH30-4XB0 — Electrical
ParameterValue
Rated value (DC)24 V
Permissible range, lower limit (DC)20.4 V
Permissible range, upper limit (DC)28.8 V
For signal "1"15 V DC at 2.5 mA
For signal "0"5 V DC at 1 mA
Current for signal "1" (typ.)4 mA
Max.70 °C
Power loss (typ.)2.5 W
Current consumption from backplane bus (5 V DC), max.130 mA
Current consumption from load voltage L+ (no load), max.4 mA; per channel
Max. cable length, shielded500 m
Max. cable length, unshielded300 m
6AG1221-1BH30-4XB0 — Performance
ParameterValue
ParameterizableYes
Diagnostic alarmYes
Diagnostics functionYes
6AG1221-1BH30-4XB0 — Environmental
ParameterValue
IP protection ratingIP20
Min.-40 °C
6AG1221-1BH30-4XB0 — Mechanical
ParameterValue
Height100 mm
Width45 mm
Depth75 mm
Weight (approx.)210 g
6AG1221-1BH30-4XB0 — Approvals
ParameterValue
CE markYes

Product details

What this module is and why you’d grab it

The 6AG1221-1BH30-4XB0: Draws 2.5 W typ from the backplane, 130 mA at 5 V DC. Low enough to fit on a crowded S7-1200 rack without worrying about power budget.

How it stacks against the 6AG1223 combi modules

This is pure 16 DI — no outputs. The 6AG1223-1PL32-4XB0 is a combi module, different footprint and wiring.

CE marked, FM approved. Clean compliance doc trail.

45 x 100 x 75 mm, IP20 plastic housing. Front connector required (sold separately). Shielded cable max 500 m, unshielded 300 m. Signal thresholds: 15 V DC at 2.5 mA for "1", 5 V DC at 1 mA for "0". Groups of 4 for channel isolation.

Frequently asked questions

What is the maximum ambient temperature rating?

70 °C maximum, with a minimum of -40 °C, covering a wide industrial range.

What compliance marks does it carry?

CE marked and FM approved. The evidence does not list RoHS/REACH separately, but standard Siemens compliance applies.

MPN
6AG1221-1BH30-4XB0