Description

GE IS215VCMIH2CB / IS215VCMIH2C Product Description

Technical Specifications

• Product Model: IS215VCMIH2CB (IS215VCMIH2C)
• Brand: General Electric (GE)
• Warranty: One Year
• Input Voltage: 5VDC core logic power, ±12VDC auxiliary circuit power, 24VDC rack backplane supply
• Operating Temperature: -30°C to +65°C
• Storage Temperature: -40°C to +85°C
• Response Time: Deterministic 20ms IONet cyclic communication cycle
• Protection Class: IP20 (installation inside sealed industrial control cabinets only)
• Accuracy Class: 0.01% data frame synchronization error for TMR voting
• Output Frequency: 10Mbps fixed IONet network transmission frequency
• Rated Current Range: 0–1.0A maximum total board power consumption
• Communication Interface: 3 × 10Base2 BNC IONet ports, 1 × RS-232 D-SUB debug port, 6U VME64 backplane edge connector
• Supported Protocols: GE proprietary IONet control network protocol, VME backplane bus protocol, RS-232 serial diagnostic protocol
• Overload Capacity: 125% transient voltage surge withstand for 15 seconds
• Dimensions: 330.2mm (Height) × 178mm (Width) × 32mm (Depth), occupies 2 standard VME rack slots
• 

Product Overview

The IS215VCMIH2CB/IS215VCMIH2C is a VCMI (VME Communications Interface) 6U VME bus master module exclusively developed for GE Speedtronic Mark VI gas and steam turbine TMR control systems. Powered by a 32-bit DSP processor with integrated dual-port memory, this board acts as the centralized communication hub within each Mark VI control rack, governing all data traffic on the internal VME backplane and establishing stable inter-rack connections via the proprietary IONet system control network. It performs rack module address management, cross-board data forwarding, TMR redundant controller synchronization, and real-time status reporting for all local I/O, servo drive and protection boards installed in the chassis.

This component mitigates critical communication failures inherent to legacy turbine control frameworks, including unsynchronized data voting between triple redundant processors, slow inter-rack signal transmission, unmonitored bus load fluctuations, and limited on-site diagnostic access for network faults. Built-in power rail monitoring and ground fault detection circuits continuously track the health of 5V, 12V and 28V internal power supplies, automatically flagging abnormal voltage conditions before they cause module lockup or control loop dropout. Isolated IONet ports suppress electromagnetic interference generated by large generators, variable frequency drives and high-voltage switchgear in power station environments.