Description
ABB 07CR41 Advant Controller 31 Basic PLC Unit
Product Overview
The ABB 07CR41 is an Advant Controller 31 Series 40 basic PLC unit designed for compact industrial control applications requiring integrated digital I/O and local expansion. ABB documentation identifies the 07CR41 as a Series 40 basic unit with 8 integrated digital inputs, 6 integrated relay outputs, two integrated potentiometers, and a 24 VDC power supply. The controller can operate as the central unit of an AC31 control system, executing the user program while managing its integrated I/O and connected central extension units.
The ABB 07CR41 uses 16 KB of user program memory implemented with Flash EPROM and SRAM for data, with programming communication provided through an RS-232 interface. The Series 40 architecture supports up to six central extension units, giving the basic unit a practical expansion path for applications that exceed its integrated I/O capacity. ABB documentation specifies a 24 VDC supply range of 19.2–30 VDC for the DC-powered version, while the AC31 documentation also distinguishes a separate 120/230 VAC 07CR41 variant; therefore, the exact supply version must be confirmed from the complete ordering code and nameplate before replacement.
For maintenance work, the ABB 07CR41 should be treated as a legacy controller rather than a current-generation ABB PLC. ABB states that the and previous PLC series are obsolete and were replaced by the AC500 platform. That does not make the 07CR41 irrelevant to installed equipment: where an existing machine or process still depends on hardware and software, a correctly matched replacement can avoid an unnecessary control-system migration.
Product Introduction
The 07CR41 belongs to ABB’s Advant Controller 31 Series 40, a compact PLC platform intended for distributed and machine-level automation. The basic unit combines CPU functionality, memory, power supply, and a set of integrated digital I/O in one housing.
The integrated I/O consists of eight digital inputs and six relay outputs. The two front-access potentiometers can also be read by the control program, making them useful for operator-adjustable setpoints or commissioning parameters in suitable applications. ABB documentation identifies high-speed counter functions on designated inputs, including incremental encoder operation up to 5 kHz and standalone counter operation up to 7 kHz under the specified configurations.
The unit can be expanded with up to six central extension units. This makes the 07CR41 more than a fixed 14-point controller; it can serve as the CPU/basic unit within a larger Series 40 local I/O arrangement.
Main Features and Advantages
Integrated PLC Control and I/O
The 07CR41 combines controller processing with 8 digital inputs and 6 relay outputs, reducing the amount of separate hardware required for a small control installation. The relay outputs are electrically isolated from the electronics, with ABB documentation specifying 1500 Vrms isolation for the integrated outputs.
24 VDC Industrial Supply
The DC version operates from a nominal 24 VDC supply, with an allowable range of 19.2 to 30 VDC. ABB documentation specifies polarity-reversal protection for the DC-powered version. This makes the controller suitable for conventional industrial control cabinets using a regulated 24 VDC control supply.
Local Expansion Capability
A Series 40 07CR41 can support up to six central extension units. The architecture therefore allows additional digital and analog I/O to be connected without replacing the central controller. The documented maximum system configuration reaches 104 digital inputs, 102 digital outputs, 24 analog inputs, and 12 analog outputs, including the integrated I/O where applicable.
07CR41
Program and Data Memory
The controller provides 16 KB of user program memory, typically corresponding to approximately 4,000 instructions in the documented configuration. Flash EPROM is used for the program/constants area, while SRAM is used for data. This memory architecture is characteristic of the generation and should be considered when transferring an existing application to replacement hardware.
Programming and Commissioning
The Series 40 documentation identifies an RS-232 interface for programming and communication functions. ABB’s historical documentation also identifies AC31GRAF as the programming environment for Series 40 and Series 50 controllers. Existing projects should therefore be backed up before hardware replacement, and the installed software version should be checked rather than assuming that a replacement unit will accept a project without conversion or configuration work.
Procurement and Replacement Considerations
The most important issue with a 07CR41 replacement is variant identification. ABB documentation contains both 24 VDC and 120/230 VAC versions under the 07CR41 designation. Do not determine the supply voltage from the generic model number alone. Verify the nameplate, complete ABB ordering number, terminal arrangement, firmware, and existing cabinet wiring before installation.
Because is an obsolete platform, used or refurbished units should receive more than a cosmetic inspection. Recommended checks include power-up behavior, CPU/run status, input-channel operation, relay-output operation, communication through the programming port, memory retention, and operation with the installed extension modules.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | 07CR41 |
| Product Family | Advant Controller 31 |
| Series | Series 40 |
| Product Type | PLC Basic Unit / Central Controller |
| DC Supply Version | 24 VDC nominal |
| DC Supply Range | 19.2–30 VDC |
| Integrated Digital Inputs | 8 |
| Integrated Digital Outputs | 6 |
| Output Type | Relay |
| Integrated Potentiometers | 2 |
| User Program Memory | 16 KB Flash EPROM |
| Data Memory | SRAM |
| Central Extension Units | Up to 6 |
| Programming Interface | RS-232 |
| High-Speed Counter | Up to 5 kHz incremental encoder / 7 kHz standalone counter, according to configuration |
| Output Isolation | 1500 Vrms |
| Typical DC Consumption | 120 mA basic unit |
| Typical Maximum-Configuration Consumption | 400 mA |
| Mounting | DIN rail or plate mounting |
| Weight | Approx. 400 g for the 24 VDC Series 40 version |
| Platform Status | Obsolete / legacy |
| Successor Platform | ABB AC500 |
The 120/230 VAC version requires separate identification because ABB’s documentation lists a 07CR41 configuration with AC supply as well. Confirm the complete ordering code before specifying the power supply.
Related Products
- ABB 07CT41 — Series 40 basic unit with transistor outputs
- ABB 07KR51 — Series 50 basic unit
- ABB 07KT51 — Series 50 basic unit with transistor outputs
- ABB Series 40 extension units
- ABB Series 90 controllers
- ABB AC500 PLC platform
Frequently Asked Questions
What is the ABB 07CR41?
The 07CR41 is an Advant Controller 31 Series 40 basic PLC unit with integrated digital I/O.
How many I/O points are built into the 07CR41?
The standard Series 40 configuration has 8 digital inputs and 6 relay outputs, plus two integrated potentiometers.
Is the ABB 07CR41 a 24 VDC PLC?
There is a 24 VDC version with a nominal 24 VDC supply and an allowable range of 19.2–30 VDC. ABB documentation also lists a 120/230 VAC 07CR41 variant, so the complete part number must be checked.
Does the 07CR41 support expansion I/O?
Yes. The Series 40 basic unit can support up to six central extension units.
What programming interface does it use?
The Series 40 documentation specifies an RS-232 interface for programming and related communication functions.
Is 07CR41 still manufactured by ABB?
ABB identifies the and previous PLC series as obsolete and states that they were replaced by the AC500 PLC platform.
What should be checked before replacing a 07CR41?
Verify the complete ordering code, supply-voltage variant, I/O wiring, extension units, program backup, software compatibility, and controller revision. For a used replacement, test the CPU, integrated inputs, relay outputs, programming interface, and memory retention before placing it into service.
