Product Overview
Downtime in a process line rarely announces itself. The Schneider Electric 140CPU67261C is a Unity Hot Standby Processor built for the Modicon Quantum automation platform, and it exists for one reason: keeping control running when a primary controller stops. With a 266 MHz clock frequency and hot standby redundancy, it gives oil, gas, and heavy industrial sites a practical path to fault-tolerant operation.
This is a Unity processor, not a general-purpose CPU. It supports dual local rack integration and is designed for configurations of 2, 4, 6, 10, or 16 slots, so you can size the system to the process rather than the other way around.
Technical Specifications
The 140CPU67261C carries 11,264 kB of internal RAM, with 1,536 kB reserved for data. Memory expands through an 8 MB PCMCIA card for file storage. Processing performance reaches 10.28 Kinst/ms at 100% Boolean, or 10.07 Kinst/ms at 65% Boolean and 35% numerical.
I/O capacity is where this processor separates itself. It handles 31,744 discrete remote I/O points and 8,000 distributed points per Modbus Plus network, plus 1,984 analog remote points and 500 analog distributed points per network. Distributed I/O reaches 63 stations across one rack and three Modbus Plus networks. Remote I/O supports 31 stations per network over S908, Ethernet Quantum, and Ethernet X80.
Communication runs across Ethernet TCP/IP, Modbus Plus, Profibus DP, USB, and single-mode fiber optic. The unit allows up to 6 Ethernet, 6 Modbus Plus, and 6 Profibus DP local connections, plus 1 USB. Bus current requirement is 2,760 mA.
Integration Note
Wiring into Ethernet, Modbus Plus, or Profibus DP networks may require an external gateway or connection module. Confirm cables and gateways with your supplier before commissioning.
Where the 140CPU67261C Fits
Redundancy matters most where a stoppage costs more than the hardware. A pipeline compressor station running a primary and secondary PLC pair over single-mode fiber can span up to 16 km between racks — the integrated LC fiber connector supports exactly that. If the primary drops, the standby takes over without a local I/O gap, because local I/O is intentionally forbidden in Hot Standby applications.
In water treatment and power generation, the same logic applies. The 140CPU67261C manages accurate time stamping, counters, serial links, and high-speed interrupt inputs, which suits sequence-of-events recording and coordinated control. For distributed pumping or metering networks, 63 Modbus Plus stations per rack give real reach without adding controllers.
Practical Selection Notes
Before ordering, confirm your rack count, slot configuration, and network topology. This processor supports 2, 4, 6, 10, or 16 slots and two local racks. Check that your application does not rely on local I/O — Hot Standby mode forbids it. Also verify task structure: periodic fast tasks, I/O interrupt tasks, and auxiliary tasks are not permitted in Hot Standby applications.
The unit carries conformal coating (Humiseal 1A33) and certifications including ATEX zone 2, IEC-Ex, CE, UL, CSA, and GOST, so it suits hazardous and marine environments where those ratings are required.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. For spares when you need them, fast dispatch, worldwide, contact Oil AutoTech today for pricing and availability.
FAQ
What makes the 140CPU67261C different from a standard Quantum processor?
It is a Unity Hot Standby Processor with built-in redundancy support, dual local rack integration, and a fiber optic link for interconnecting primary and secondary PLCs up to 16 km.
How much I/O can this processor handle?
Up to 31,744 discrete remote I/O points and 8,000 distributed points per Modbus Plus network, plus 1,984 analog remote and 500 analog distributed points per network.
Can I use local I/O with this module?
No. Local I/O is forbidden in Hot Standby applications. Plan for remote or distributed I/O instead.
What communication protocols does it support?
Ethernet TCP/IP, Modbus Plus, Profibus DP, USB, and single-mode fiber optic, with up to 6 local connections each for Ethernet, Modbus Plus, and Profibus DP.
Is the 140CPU67261C suitable for hazardous areas?
It carries ATEX zone 2, IEC-Ex, and HazLoc certifications along with CE, UL, CSA, GOST, and marine approvals. Confirm your specific area classification before installation.
