Siemens 3RK1207-3CE00-2AA2 AS-Interface SlimLine Compact SC22.5 4AI RTD Module

Overview

SIEMENS AS-Interface SlimLine Compact

3RK1207-3CE00-2AA2 AS-Interface SlimLine Compact SC22.5 4AI RTD Module

Read four resistance or RTD signals through screw terminals and transfer the measured values over AS-Interface in a 22.5 mm wide module.

At a Glance

Brand	Siemens
Model	3RK1207-3CE00-2AA2
Product Type	Analog input module
Core Function	Acquire resistance and temperature measurements
Application	AS-i control-cabinet networks

RTD and resistance ranges

Pt100, Ni100 and resistance measurements use selectable conversion ranges.

Screw-terminal wiring

Four-wire measurement terminals also accommodate simulated two- and three-wire connections.

Selectable active channels

DIP switches deactivate unused channels to improve the analog transmission time.

Product Overview

3RK1207-3CE00-2AA2 connects resistance thermometers and resistive sensors to an AS-Interface network using four analog inputs. The SlimLine Compact SC22.5 enclosure uses screw terminals and a standard-address AS-i slave interface.

Selectable 50 or 60 Hz filtering and switchable measured-value smoothing allow the analog acquisition to be adapted to the installation, while front LEDs indicate communication and fault status.

Ordering focus: Select the correct RTD characteristic and wire arrangement, and deactivate unused input channels with the device de-energized.

Key Functions

Measure RTD temperatures and resistance

The module converts Pt100, Ni100 and 0 to 600 Ω signals into cyclic analog values for the AS-i master.

Adapt noise rejection and smoothing

Parameter bits select 50 or 60 Hz interference suppression and enable a first-order digital smoothing filter.

Reduce unused channel traffic

AI0 remains active, while DIP switches can deactivate AI1 through AI3 when fewer measurements are required.

Official Specifications

Analog Input Channels	4, with AI0 permanently active
AS-i Slave Profile	7.3.E; standard-address slave
Measurement Resolution	15 bits plus sign
Pt100 Standard Range	−200 to +850 °C
Pt100 Climatic Range	−120 to +130 °C
Ni100 Temperature Range	−60 to +250 °C
Resistance Measuring Range	0 to 600 Ω
Measurement Connection	Floating, 4-wire; 2- and 3-wire simulated through 4-wire terminals
Input Resistance	2 MΩ
Measuring Current	1.667 mA
Maximum Input Voltage to Ground	±10 V destruction limit
Maximum Differential Input Voltage	±20 V destruction limit
Interference Suppression Selection	50 Hz or 60 Hz
Smoothing Time Constant	1 module read-in cycle without smoothing; 8 cycles with smoothing
Communication Watchdog	Fault indication after more than 50 ms without a master data telegram
Terminal Connection	Screw terminals
Overall Width	22.5 mm
Degree of Protection	IP20

Official source:Siemens product manual and technical specifications

Frequently Asked Questions

Can I connect both Pt100 and Ni100 sensors to 3RK1207-3CE00-2AA2?

The module supports Pt100 and Ni100 measuring modes with the selected parameter setting.

Does 3RK1207-3CE00-2AA2 support Screw-terminal wiring for mobile equipment?

The Pt100 climatic range covers −120 to +130 °C with a measured-value increment of 0.01 °C.

Does 3RK1207-3CE00-2AA2 require an auxiliary power connection for RTD measurement?

No, the resistance and thermal-resistance module is supplied through AS-i without an auxiliary supply.

How can I shorten the analog transfer time when using only one sensor on 3RK1207-3CE00-2AA2?

Deactivate unused AI1 through AI3 with the DIP switches while the module is de-energized.

Can I turn off every input channel of 3RK1207-3CE00-2AA2?

No, analog input AI0 always remains active.

How should I choose the noise filter for 3RK1207-3CE00-2AA2?

Set the interference suppression parameter to the installation line frequency of either 50 or 60 Hz.

Why does the red FAULT LED remain on when 3RK1207-3CE00-2AA2 loses master communication?

The communication watchdog sets the I/O fault bit when no master data telegram is received for more than 50 ms.

Compatibility & Ordering Notes

Before ordering 3RK1207-3CE00-2AA2: Choose the screw-terminal RTD variant and reserve a standard AS-i slave address, then match the sensor range and simulated two-, three- or four-wire connection.

Compatibility Checklist for 3RK1207-3CE00-2AA2

• Use the Pt100 or Ni100 characteristic appropriate to the connected sensors.
• Change active-channel DIP switches only while de-energized.
• Keep unused connection terminals unassigned after disabling their channels.
• Protect the IP20 module from conductive contamination inside a suitable cabinet.

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