Product details
Specifications
Recommand
Service & Policy

01PRODUCT DETAILS

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PRODUCT PROFILE

SERIESSIMATIC S7-300

CONDITIONNew Original

WARRANTYOne year

AVAILABILITYIn stock

Siemens 6ES7321-7RD00-0AB0
SM 321 Ex Digital Input Module

A four-channel isolated 24 V DC digital input module for NAMUR signals from hazardous-area devices.

Siemens Products 6ES7321-1BH10-0AA0 6ES7951-1KH00-0AA0 6ES7952-0KF00-0AA0

02SPECIFICATIONS

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DETAILED PRODUCT DESCRIPTION

SM 321 Ex digital input

The SIMATIC S7-300 SM 321 accepts four isolated 24 V DC digital inputs for NAMUR/DIN 19234 signals from hazardous areas. Its diagnostic capability and PTB-tested design support monitored signal acquisition in process automation systems.

14 isolated digital inputs

224 V DC NAMUR signals

3Diagnostic-capable Ex input

Official technical data

Product designationSM 321

Digital inputs4

Input voltage24 V DC

Signal standardNAMUR / DIN 19234

System integration

Signal originHazardous-area devices

IsolationGalvanically isolated

DiagnosticsSupported

Approval notePTB tested

✓

Diagnostic Protection

The module supports diagnostics for monitored Ex-area input circuits. Use the diagnostic information when tracing signal faults and verify approved intrinsically safe circuit conditions before returning the station to service.

↗

Installation & Upgrade

Install the module in a compatible S7-300 station and route hazardous-area signals according to the approved system documentation. Before replacement, switch the station to a safe state and verify the complete article number and terminal assignment.

03RECOMMAND

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Brand characteristics

Siemens S7-300 modules provide documented order numbers, coordinated rack integration and established lifecycle support for modular controller systems.

Platform coordinationMatched I/O, interfaces and engineering tools

Documented lifecycleClear order numbers and product data

Field-ready designDistributed hardware for industrial environments

Application fields

This module is intended for monitored digital signal acquisition from hazardous process areas.

Process plantsNAMUR sensor inputs

Hazardous areasIsolated signal acquisition

System serviceS7-300 Ex I/O replacement

Siemens

Industrial automation modules

6ES7143-5AF00-0BA06ES7142-5AF00-0BA06ES7141-5AH00-0BA06ES7141-5AF00-0BA06ES7144-5KD00-0BA06ES7145-5ND00-0BA06ES7157-1AB00-0AB06ES7134-6HB00-0CA16ES7132-6BF01-0AA06ES7131-6BF01-0BA06ES7193-6BP00-0BA06ES7193-6BP20-0BA06ES7134-6GD01-0BA16ES7132-6BH01-0BA06ES7131-6BH01-0BA06ES7133-6BH01-0BA06ES7147-5JD00-0BA06ES7146-5FF00-0BA06ES7155-6AU01-0CN06ES7193-6AR00-0AA0

Helmholz

Industrial communication and system accessories

700-972-0BA12700-972-7BA12700-751-1VK21700-752-1AA23700-859-1BB01700-860-MPI01700-600-1AA11700-600-2AA11700-600-3AA11700-500-0AA01700-400-1AA01700-400-2AA01700-300-1AA01700-300-2AA01700-751-8VK21700-972-0BB12700-972-7BB12700-158-0AD02700-153-8AA01700-151-0AA23

04SERVICE & POLICY

Email : sales9@apterpower.com

QUOTE

Price and lead time

Confirm the complete model, condition and requested quantity for a clear quotation and availability reply.

DISPATCH

Order preparation

Confirmed goods are prepared with delivery documentation and coordinated dispatch information.

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Siemens 6ES7321-7RD00-0AB0 Datasheet

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