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Siemens SIMATIC S7-200 CN 6ES7231-7PB22-0XA8 EM 231 Two-Channel RTD Analog Input Module

Siemens SIMATIC S7-200 CN 6ES7231-7PB22-0XA8 EM 231 Two-Channel RTD Analog Input Module

Siemens SIMATIC S7-200 CN EM 231 RTD Analog Input Module

Complete Model

6ES7231-7PB22-0XA8

Official Product Description

Siemens 6ES7231-7PB22-0XA8 EM 231 S7-200 CN analog input module with two RTD channels for supported resistance temperature detectors and resistance ranges.

CORE FEATURE: Two RTD inputs with 15-bit plus sign resistance measurement and selectable sensor types.

LEAD TIME: In stock

WARRANTY: 1 year

Email Inquiry [email protected]

WhatsApp +86 18159889985

Appurtenance:

siemens simatic s7 200 cn 6es7231 7pb22 0xa8 em 231 rtd module-1

Overview
Technical Data
Inquiry
Features
Interfaces
Installation
Environment
FAQ
Recommend Models
Recommended Products

Product Overview

6ES7231-7PB22-0XA8 is the Siemens SIMATIC S7-200 CN EM 231 analog input module for two RTD channels.

Siemens cross-references this S7-200 CN article to 6ES7231-7PB22-0XA0 and directs users to the standard product in Appendix A for wiring and performance specifications.

The module supports selectable platinum, nickel and copper RTDs plus resistance ranges. It accepts 2-wire, 3-wire or 4-wire RTD connections and is designed for S7-200 CPU 222, CPU 224, CPU 224XP and CPU 226 systems.

Technical Data

Complete model	6ES7231-7PB22-0XA8
Brand	Siemens
Product family	SIMATIC S7-200 CN
Product type	EM 231 RTD analog input expansion module
Analog inputs	2 RTD channels
Input type	Module-ground-referenced RTD; 2-wire, 3-wire or 4-wire connection
Supported sensor families	Selectable platinum, nickel and copper RTDs plus 150, 300 and 600 ohm full-scale resistance ranges
Resistance resolution	15 bits plus sign
Temperature resolution	0.1 degree C or 0.1 degree F
Measuring principle	Sigma-delta
Module update time	405 ms for both channels; 700 ms for Pt10000
Input impedance	At least 10 megohms
Basic error	0.1 percent full scale for resistance
Supply	20.4 to 28.8 V DC user power; 87 mA from 5 V DC backplane and 60 mA from 24 V DC
Dimensions	71.2 x 80 x 62 mm, width x height x depth
Weight	210 g
Power dissipation	1.8 W
Compatible CPUs	S7-200 CPU 222, CPU 224, CPU 224XP and CPU 226
Official source	Siemens S7-200 System Manual, pages 424 to 435 and S7-200 CN cross-reference page 513; PDF pages 438 to 449 and 527

Inquiry

CONTACT

STELLA

Email Inquiry [email protected]

WhatsApp +86 18159889985

Features

Two RTD channels

Two analog inputs accept supported resistance temperature detectors or selected resistance ranges.

Flexible sensor wiring

The module supports 2-wire, 3-wire and 4-wire RTD connections.

DIP-switch configuration

Sensor type, wiring configuration, temperature scale and burnout direction are selected with the module DIP switches.

Status diagnostics

The module reports range and user-supply faults through status bits and LEDs, with open-wire detection handled internally.

Interfaces

Channel A	A+, A-, a+ and a- terminals for the first RTD channel.
Channel B	B+, B-, b+ and b- terminals for the second RTD channel.
User power	L+ and M terminals for the 24 V DC user supply.
Backplane	S7-200 expansion bus connection for CPU communication and 5 V DC module power.
Maximum sensor cable	Up to 100 m according to the official RTD module specification.

Installation

01 - Verify the CN article

Match 6ES7231-7PB22-0XA8 on the Siemens label and confirm the EM 231 two-channel RTD identity.

02 - Confirm CPU compatibility

Use the module with a compatible S7-200 CPU 222, CPU 224, CPU 224XP or CPU 226.

03 - Select one RTD type

Configure the DIP switches for the intended RTD or resistance range; all connected RTDs must use the same selected type.

04 - Wire the channels

Use the official terminal diagram for the selected 2-wire, 3-wire or 4-wire sensor connection and provide 24 V DC user power.

05 - Commission diagnostics

Read channel data and module status bits often enough to detect open-wire, out-of-range and user-power faults.

Environment

CN cross-reference

Siemens maps 6ES7231-7PB22-0XA8 to 6ES7231-7PB22-0XA0 for wiring and performance data.

Electrical isolation

500 V AC from field to logic, field to 24 V DC, and 24 V DC to logic.

Interference suppression

85 dB at 50 Hz, 60 Hz and 400 Hz.

Maximum sensor cable

100 m.

Diagnostics

System-fault and 24 V status LEDs, range-status bit and user-power fault indication.

Mechanical data

71.2 x 80 x 62 mm; 210 g; 1.8 W dissipation.

FAQ

Q1. How can the exact quoted 6ES7231-7PB22-0XA8 be verified?

Match the full 6ES7231-7PB22-0XA8 article number and confirm that the label identifies an S7-200 CN EM 231 module with two RTD inputs.

Q2. How can New, Used or Refurbished condition be distinguished?

Request date-marked photos of the label, DIP switches, RTD terminals, expansion-bus connector, LEDs, housing and packaging. Check for terminal wear, bent pins, replaced labels or repaired plastic.

Q3. How should supplier legality and reliability be checked?

Verify the legal entity, registered address, payment beneficiary and traceable contact. The offer should state Siemens, 6ES7231-7PB22-0XA8, EM 231 RTD, condition and quantity.

Q4. Which specifications must engineering confirm before purchase?

Confirm two RTD channels, the required sensor type, 2-wire to 4-wire connection, 20.4 to 28.8 V DC user power, S7-200 CPU compatibility, 71.2 x 80 x 62 mm size and 210 g weight.

Q5. What physical evidence should be requested before payment?

Ask for date-marked photos showing the complete article number, DIP-switch bank, both channel terminal groups, L+ and M power terminals, status LEDs, bus connector and sealed packaging.

Q6. Can 6ES7231-7PC22-0XA0 or 6ES7231-7PB22-0XA0 replace this model?

Not without documented approval. The 7PC22 version has four RTD inputs, while 6ES7231-7PB22-0XA0 is the standard-product cross-reference. Confirm regional approval, exact article number and system requirements before substitution.

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