Schneider BMXP3420102 Processor Module — Engineering Overview
The Schneider BMXP3420102 processor module belongs to the Modicon M340 automation platform. Engineers rely on this module for medium-scale control applications requiring robust communication and flexible I/O handling. This article explores its core technical specifications and engineering principles based strictly on the product datasheet.
Processor Performance and I/O Capacity
The BMXP3420102 supports up to 1024 discrete I/O in multi-rack configurations and 256 analog I/O in multi-rack setups. For single-rack configurations, it handles 704 discrete and 66 analog I/O. This module also supports up to 36 application-specific channels. Execution times meet typical industrial demands: 0.12 µs for Boolean operations, 0.25 µs for single-length words, and 1.16 µs for floating points. The processor achieves 6.4 Kinst/ms with 65% Boolean and 35% fixed arithmetic, or 8.1 Kinst/ms with 100% Boolean instructions. System overhead remains low at 0.7 ms for the master task and 0.13 ms for the fast task.
Connectivity and Communication
This module offers integrated serial links via RJ45 ports supporting RS232C and RS485 at 0.3…19.2 kbit/s. It operates in character mode or Modbus RTU/ASCII (master/slave). A USB port provides 12 Mbit/s connectivity. For motion control, it includes a CANopen master bus (SUB-D 9) supporting speeds from 20 kbit/s to 1 Mbit/s. The module manages up to 63 CANopen server devices and supports up to 2 Ethernet communication modules and 4 AS-Interface modules. Embedded services include network management (NMT), Process Data Objects (PDO), and Service Data Objects (SDO) over CANopen.
Memory Architecture
The BMXP3420102 comes with a supplied memory card (BMXRMS008MP) for backup of programs, constants, symbols, and data. Internal RAM totals 4096 kB, divided into 256 kB for data and 3584 kB for program, constants, and symbols. Object areas include 256 kB unlocated internal data and up to 32634 %Mi located internal bits. Default allocated areas hold 1024 %MWi internal words, 256 %KWi constant words, and 512 %Mi located internal bits. This architecture supports one cyclic/periodic master task, one periodic fast task, and up to 64 event tasks.
Environmental and Certification Details
The module operates in ambient temperatures from 32 to 140 °F (0 to 60 °C) with relative humidity up to 95% without condensation. It carries an IP20 degree of protection and a protective treatment marking of TC. Compliance includes CE, UL, CSA, RCM, EAC, and Merchant Navy certifications. The unit meets standards EN 61131-2, EN/IEC 61010-2-201, and UL 61010-2-201. It also qualifies for hazardous locations (Class I Division 2). Power consumption is 90 mA at 24 V DC, supplied internally via the rack. The net weight is 0.46 lb (0.21 kg).
Practical Engineering Considerations
When designing a system with the BMXP3420102, engineers must consider the communication bus lengths and device counts. For example, CANopen segments support up to 64 devices at 500 kbit/s over 100 m. Modbus point-to-point links reach up to 49.2 ft (15 m) for character mode. Proper termination and cable selection ensure reliable operation. The diagnostic counters for Modbus and event counters help with troubleshooting. Engineers should also account for the 0.13 ms fast task overhead when designing time-critical applications.
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