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ABB 07KR51-HSB 07KR51 1SBP260011R1001

ABB 07KR51-HSB is a hot standby redundant CPU based on the 50-series central unit. It is specially designed for the CS31 bus and supports master/slave hot standby function. When the master station fails, the slave station can take over control within 3 cycles to ensure uninterrupted production processes. It integrates 8 channels of digital input (24V DC) and 6 channels of relay output, suitable for industrial automation scenarios requiring high reliability. 100% brand new original, with a 1-year warranty.

Item NO.:
07KR51
Payment:
T/T
Market Price:
$300
Price:
$300/PC
Product Origin:
U.S.A.
Color:
Light gray
Shipping Port:
Xiamen，China
Lead Time:
5-7 days
Goods Stock:
10
Product weight:
0.4kg

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product introduction

Manufacture	ABB
Model	07KR51-HSB
PN No.	07KR51-HSB
Catalog	AC 31
Description	Hot standby redundant CPU based on the 50-series central unit
Origin	Switzerland
HS CODE	85389091
Dimension	120 x 93 x 84（MM）
Weight	0.4kg

Description:
The ABB 07KR51-HSB is a central unit with Hot Standby redundancy function in the ABB AC31 50 series. It realizes master/slave redundant configuration via the CS31 fieldbus. When the master station shuts down due to a fault, the slave station can automatically take over bus control within no more than 3 program cycles, ensuring the continuity of on-site I/O data and the stability of technological processes.

FEATURES:

Modular Design

The 07KR51-HSB supports flexible system expansion. Additional I/O modules (same as standard 40/50 series) can be directly connected to the central unit to increase the number of binary or analog I/O. Furthermore, decentralized I/O units such as ICMK14F1, ICMK14N1, or DC551 can be connected via the CS31 twisted-pair bus, allowing the system to adapt to various application scales.

Input/Output Functions

The built-in I/O includes 8 isolated digital inputs (24V DC, compatible with both PNP and NPN sensors) and 6 relay outputs (250V AC / 2A per channel). The system can be further expanded with additional digital/analog I/O modules. The relay outputs are suitable for resistive and inductive loads, with a total switching capacity of up to 12A.

Communication Interface

The 07KR51-HSB features a CS31 fieldbus (RS485, shielded twisted pair) for real-time communication and hot-standby redundancy between master and remote units. It also provides a separate serial port (RS232/RS485) for programming or ASCII/MODBUS communication with higher-level systems.

High Performance and Reliability

The hot-standby function ensures bumpless switchover within ≤3 cycle times upon master failure, maximizing system availability. Synchronized execution between master and remote guarantees process continuity.

Parameters:

Brand:ABB
Model: 07KR51-HSB
Type: PCL CPU Module
Application: redundant control systems
Communication Interface: CS31(RS48S) for hot-standby and remote I/O
Number of Batteries: 0
SCIP: No SVHC present

QA:

Q1. What is the main function of the 07KR51-HSB module?

A1. The 07KR51-HSB is a hot standby central unit based on the ABB AC31 50 series. It supports redundant CS31 bus architecture: when the master unit fails, the remote standby unit automatically takes over control of the I/O within maximum 3 cycle times, ensuring uninterrupted process operation.

Q2. What are the built‑in I/O points of the 07KR51-HSB?

A2. It has 8 isolated digital inputs (24V DC, PNP/NPN compatible) and 6 relay outputs (250V AC / 2A per channel). The total continuous output current is 12A. Additional I/O can be added via local expansion modules or remote I/O stations (ICMK14, DC551, etc.)

Q3. How do I configure the hot‑standby mode?

A3. Use AC31GRAF programming software. In the PLC configuration tool, set the central unit operative mode for CS31 bus. For the master, set system constant for the remote unit – depending on required behaviour – set (self‑start) or (starts only after master failure). Both master and remote must have identical cycle times.