Skip to main content
Log in
Siemens 6AG1321-7TH00-4AB0 — PLC I/O & Expansion Modules

Siemens 6AG1321-7TH00-4AB0 NAMUR DI Module, 70°C

MPN6AG1321-7TH00-4AB0

Siemens SIPLUS S7-1500 16-channel NAMUR digital input module, -40 to 70°C, 40-pin, diagnostics, UL.

Siemens 6AG1321-7TH00-4AB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6AG1321-7TH00-4AB0 — I/O
ParameterValue
Digital inputs16
6AG1321-7TH00-4AB0 — Electrical
ParameterValue
Rated value (DC)8.2 V; 8.2V/18V
Current for signal "1" (typ.)10 mA; for NAMUR: 2.1 to 7 mA, for 10k ohm/47k ohm contact: typical 10mA, for 4 wire BEROs: typical 10 mA
Max.70 °C
Power loss (typ.)11 W
Current consumption from backplane bus (5 V DC), max.100 mA
Current consumption from load voltage L+ (no load), max.100 mA
Short-circuit protectionYes; Electronic
Reverse polarity protectionYes
Isolation test voltage600 V DC
Isolation: between channelsYes
Isolation: channels to backplane busYes
Max. cable length, shielded400 m; max. 200m with 8.2 V sensor, max. 400m with 18 V sensor
Max. cable length, unshieldedNot permitted
6AG1321-7TH00-4AB0 — Performance
ParameterValue
Diagnostic alarmYes
Diagnostics functionYes
Group fault indicator (SF, red LED)Yes
6AG1321-7TH00-4AB0 — Environmental
ParameterValue
Min.-40 °C
6AG1321-7TH00-4AB0 — Mechanical
ParameterValue
Height125 mm
Width40 mm
Depth120 mm
6AG1321-7TH00-4AB0 — Approvals
ParameterValue
CE markYes

Product details

Signal integrity realities

The 6AG1321-7TH00-4AB0: Unshielded cable is not permitted on these inputs — a hard stop. Shielded runs max out at 400 metres with an 18 V sensor supply, but drop to 200 m if you're using the 8.2 V rail (e.g. for NAMUR proximity switches). Plan cable lengths accordingly before the pull. The module issues wire-break and short-circuit alarms, plus a hardware interrupt and diagnostic alarm. That means you don't chase intermittent contacts blindly — the SF (red) group error trips immediately. Signal current for NAMUR is 2.1 to 7 mA typ.; a 10k/47k contact lands around 10 mA. If the current looks off, check the shield first — it's noise till proven otherwise.

This module carries CE, UL (File E239877), KC, EAC, and RCM approvals — covers most global markets for a panel build. The CE mark implies EU compliance.

Frequently asked questions

What is the operating temperature range of this module?

Rated for -40 °C minimum and 70 °C maximum, making it suitable for extended-temperature environments.

Can I use unshielded cable for the inputs?

No, the specifications state that unshielded wiring is not permitted. Shielded cable is required, with maximum lengths depending on sensor voltage: 400 m at 18 V, 200 m at 8.2 V.

MPN
6AG1321-7TH00-4AB0