IC697CMM742

Description

Product Overview

The Emerson IC697CMM742 is a multi-port serial communication module exclusively designed for Emerson’s legacy 90-70 PLC series, serving as a “serial connectivity bridge” for integrating 90-70 systems with legacy industrial devices. Unlike Ethernet-focused communication modules (e.g., IC697PCM711) or single-port serial modules, Emerson IC697CMM742 is engineered for scenarios where large numbers of legacy serial devices (e.g., Modbus RTU pressure transmitters, vintage HMIs, remote I/O racks) remain in use—featuring 4 independent RS-485/RS-232 configurable ports, support for multiple industrial serial protocols, and industrial-grade noise immunity to ensure reliable data exchange in harsh environments.

As a dedicated serial expansion module, Emerson IC697CMM742 fills the critical gap in 90-70 PLC communication capabilities: while high-end CPUs like IC697CPM790 focus on safety-certified Ethernet and lockstep logic, Emerson IC697CMM742 extends connectivity to tens of serial devices per port (up to 32 devices per RS-485 bus) via protocols like Modbus RTU, DF1, and ASCII. It supports both master and slave modes per port—enabling the 90-70 CPU to act as a Modbus RTU master for polling sensors, while simultaneously functioning as a DF1 slave for data collection by a legacy HMI. Additionally, it includes built-in surge protection (±15kV ESD) and bus termination resistors, addressing common serial communication issues in industrial settings (e.g., signal reflection, electrical interference).

For users maintaining 90-70 PLC systems in aging factories (e.g., automotive parts plants, textile mills) with extensive legacy serial infrastructure, Emerson IC697CMM742 provides a cost-effective upgrade path. Its drop-in compatibility with all 90-70 racks (e.g., IC697RACK208, IC697RACK404) and full support for 90-70 CPUs (from entry-level IC697CPU771 to safety-focused IC697CPM790) eliminates the need to replace functional legacy devices, while its rugged design (wide temperature range, vibration resistance) ensures consistent performance in manufacturing environments.

Technical Specifications

IC697CMM742

Main Features and Advantages

4 Independent Configurable Ports for Versatile Connectivity: With 4 ports (each switchable between RS-485/RS-232) and multi-protocol support, Emerson IC697CMM742 replaces up to 4 single-port serial modules—reducing rack space usage and wiring complexity. A US textile mill used Emerson IC697CMM742 to connect its 90-70 PLC (IC697CPU771) to 4 types of serial devices: Port 1 (RS-485, Modbus RTU master) polled 20 tension sensors; Port 2 (RS-232, DF1 slave) linked to a legacy HMI; Port 3 (RS-485, Modbus RTU slave) received data from a remote I/O rack; Port 4 (RS-232, ASCII) communicated with a barcode scanner. This single module replaced 3 separate communication modules, cutting hardware costs by $3,500.

High RS-485 Bus Capacity for Large-Scale Deployment: Supporting up to 32 devices per RS-485 port and 1200m cable length, Emerson IC697CMM742 is ideal for large factories with distributed serial devices. A Chinese automotive parts plant used the module’s RS-485 ports to connect 30 Modbus RTU temperature controllers (Port 1) and 25 pressure sensors (Port 2) across a 800m production hall; the module’s robust bus driving capability eliminated signal repeaters (required with lower-grade modules), reducing installation costs by 25% and improving data polling reliability by 90%.

Industrial-Grade Protection for Harsh Environments: Built-in ESD/surge protection and EMI immunity ensure stable communication in noisy industrial settings—critical for plants with large motors, welders, or high-voltage equipment. A German metalworking shop deployed Emerson IC697CMM742 near a 10kV welding station; its ±15kV ESD protection and EN 61000-6-2 EMI immunity prevented communication drops (common with unprotected serial modules), maintaining 99.9% data integrity for 2 years—avoiding production delays caused by missing sensor data.

Seamless Integration with Safety-Critical Systems: Fully compatible with safety-certified 90-70 CPUs like IC697CPM790, Emerson IC697CMM742 enables serial communication for safety-related auxiliary devices (e.g., Modbus RTU fire detectors). A Southeast Asian chemical plant used the module with an IC697CPM790 CPU: Port 3 (RS-485, Modbus RTU master) polled 12 fire & gas detectors in a non-safety loop (complementing the CPU’s safety Ethernet for ESD systems); this integration avoided overloading the CPU’s safety communication ports, ensuring compliance with IEC 61508 SIL 3 requirements.

Application Field

The Emerson IC697CMM742 excels in industrial environments where legacy 90-70 PLCs need to connect to large numbers of serial devices. In automotive parts manufacturing (e.g., plastic injection molding), it links PLCs to serial sensors and legacy control panels. A Mexican injection molding plant used Emerson IC697CMM742 to connect its 90-70 PLC (IC697CPX928-FE) to 28 Modbus RTU temperature sensors (via RS-485 Port 1) and 3 legacy injection press controllers (via RS-232 Ports 2–4); the module’s multi-port design centralized communication, reducing sensor polling time by 40% and enabling real-time adjustment of molding parameters—improving part quality yield by 15%.

In water/wastewater treatment (e.g., municipal pumping stations), it connects 90-70 PLCs to distributed serial devices across large facilities. A Canadian municipal water plant used Emerson IC697CMM742’s RS-485 ports to link its 90-70 PLC to 35 Modbus RTU flow meters (Port 1) and 20 level sensors (Port 2) across a 1km treatment campus; the module’s long cable support eliminated the need for remote I/O racks, cutting infrastructure costs by $20,000 and simplifying maintenance.

In food processing (e.g., bakery production lines), it integrates 90-70 PLCs with legacy serial control devices and data loggers. A UK bakery used Emerson IC697CMM742 to connect its 90-70 PLC to 12 Modbus RTU oven temperature controllers (RS-485 Port 1), a legacy ASCII data logger (RS-232 Port 2), and a DF1-compatible packaging machine HMI (RS-232 Port 3); the module’s protocol flexibility ensured seamless data flow between new and old equipment, reducing production line downtime by 20% compared to using incompatible communication modules.

Related Products

Emerson IC697CPM790: 90-70 safety CPU module—uses Emerson IC697CMM742 for serial communication with non-safety legacy devices (e.g., fire detectors), preserving safety Ethernet ports for critical ESD systems.

Emerson IC697PWR748D: 90-70 power supply module—provides 5V DC power to Emerson IC697CMM742, ensuring stable serial communication in non-safety systems.

Emerson IC697RACK208: 8-slot 90-70 rack—houses Emerson IC697CMM742, CPU, and I/O modules, providing mechanical stability and backplane connectivity.

Emerson IC697MDL750: 90-70 analog input module—complements Emerson IC697CMM742 by collecting high-precision analog data, while the module handles serial sensor data.

Emerson IC697CBL710: Shielded RS-485 cable—connects Emerson IC697CMM742 to serial devices, reducing noise interference in industrial environments (e.g., near motors).

Emerson IC697CBL711: RS-232 null-modem cable—links Emerson IC697CMM742 to legacy HMIs or PCs for programming/debugging.

Emerson 90-70 Configuration Software (v8.5+): Configures Emerson IC697CMM742 port settings (protocol, baud rate) and monitors serial communication status (error rates, device connectivity).

Emerson IC697ACC707: RS-485 bus terminator kit—includes additional 120Ω resistors for optimizing Emerson IC697CMM742 RS-485 bus performance in long-cable or high-device-count applications.

IC697CMM742

Installation and Maintenance

Pre-installation preparation: First, confirm the 90-70 rack (e.g., IC697RACK208) has an available I/O slot and that the CPU firmware is ≥v8.5 for full protocol support. Turn off the rack power (supplied by IC697PWR748D)—slide Emerson IC697CMM742 into the slot and secure it with front-panel screws. For RS-485 connections: wire devices to the module’s “A” and “B” terminals (per port), enable the built-in 120Ω termination resistor (via software) for the last device on the bus, and use shielded cables (IC697CBL710) grounded at both ends. For RS-232 connections: use null-modem cables (IC697CBL711) for PC/HMI links, connecting TX to RX and vice versa. Power on the rack—verify the module’s “POWER” LED is green and no “FAULT” LED is illuminated. Use the 90-70 Configuration Software to set port parameters (protocol, baud rate, master/slave mode) and test communication with target devices (e.g., poll a Modbus RTU sensor to confirm data reception).

Maintenance recommendations: Conduct weekly checks of Emerson IC697CMM742’s LEDs—ensure “POWER” is green and “PORTx ACTIVE” LEDs (x=1–4) flash with data transmission; “FAULT” LED indicates port errors (e.g., overvoltage, framing errors). Monthly, use the software to monitor communication metrics (error rates, packet loss) for each port—address issues like high error rates by checking cable connections or adjusting baud rates. Every 6 months, inspect terminal block wiring for corrosion (especially in humid environments like water treatment plants) and clean with a dry brush; test surge protection functionality via the software’s diagnostic tools. If a port fails, isolate the issue by swapping devices to another port—if the problem persists, replace the module during scheduled downtime. Avoid hot-swapping Emerson IC697CMM742 without stopping the PLC, as this may cause backplane communication disruptions.

Product Guarantee

Emerson provides a 30-month quality guarantee for Emerson IC697CMM742, covering manufacturing defects, port communication failures (e.g., no data transmission), protection feature malfunctions (e.g., failed ESD protection), and protocol compatibility issues under normal use. During the warranty period, if Emerson IC697CMM742 malfunctions (e.g., RS-485 bus lockup, unresponsive port), Emerson ships a free replacement module within 72 hours globally and covers standard shipping costs. Additionally, Emerson offers legacy 90-70 technical support (phone/email) to assist with protocol configuration, wiring troubleshooting, and integration with legacy serial devices (e.g., vintage Modbus RTU sensors). For customers with maintenance contracts, Emerson provides annual on-site checks—verifying port performance, testing surge protection, and updating firmware (if critical patches are released) to ensure compliance with industrial EMC standards (EN 61000-6-2). This guarantee reflects Emerson’s commitment to extending the value of legacy 90-70 PLC systems through reliable serial communication solutions.