IS215VCMIH2CBB - VME Communication Interface Module

SPECIFICATIONS:

Part Number: IS215VCMIH2CBB
Manufacturer: General Electric
Series: Mark VI
Product Type: VME Communication Interface Module
Processor: TMS320C32 32-bit
Output channels: 18 buffered outputs
Common Mode Voltage Range: ±5 V
Body Type: 6U high VME board
Memory: Flash memory, 128k x 8
Film Rate: 10 ms (100 Hz) for simplex
Frame Rate: 40 ms (25 Hz) for TMR
Dimensions: 17.8 cm Wide x 33.02 cm High
Operating temperature: 30 to 65 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH 6421H

FUNCTIONAL DESCRIPTION:

IS215VCMIH2CBB is a VME Communication Interface Module manufactured and designed by General Electric as part of the VI Series used in GE Speedtronic Gas Turbine Control Systems. The VCMI board in the control and interface module communicates internally to the I/O boards in its rack, and to the other VCMI cards through the IONet. There are two versions, one with one Ethernet IONet port for simplex systems, and the other with three Ethernet ports for TMR systems. Simplex systems have one control module connected to one or more interface modules using a single cable. The VCMI with three separate IONet ports is used in TMR systems for communication with the three I/O channels Rx, Sx, and Tx, and with the two other control modules. This is shown in the following figure. Software Implemented Fault Tolerance (SIFT) voting is implemented in the VCMI board. Input data from each of the IONet connections is voted in each of the R, S, and T VCMI boards.

IONET:

The IONet connection on the VCMI is a BNC for 10Base2 Ethernet. The interface circuit is high impedance allowing tap connections with 50 terminals at the first and last node. The cabling distances are restricted to 185 meters per segment with up to eight nodes, using RG-58C/U or equivalent cable. The Link Layer protocol is IEEE 802.3 standard Ethernet. The application layer protocol uses Asynchronous Device Language (ADL) messaging with special adaptations for the input/output handling and the state exchanges. The VCMI board acts as the IONet Master and polls the remote interface module for data. The VCMI Master broadcasts a command to all slave stations on a single IONet causing them to respond with their message consecutively. To avoid collisions on the media, each station is told how long to delay before attempting to transmit. Utilizing this Master/slave mechanism, and running at 10 Mb/s, the IONet is capable of transmitting a 1000-byte packet every millisecond (8 MHz bit rate).

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FREQUENTLY ASKED QUESTIONS:

Where is the VME Communication Interface Module typically used?

It is widely used in industrial control systems, particularly in gas and steam turbine control systems, such as GE's Mark VI systems. These modules are designed for high-reliability and mission-critical applications that require precise control and real-time communication.

What type of communication protocols does the VCMI module support?

The VME Communication Interface Module typically supports proprietary protocols used within the specific control system, such as the ones used in GE's Mark VI systems. It manages real-time communication between system components to ensure smooth and reliable operation.

What happens if the VCMI module fails?

If the VCMI module fails in a non-redundant system, communication between the processors and the VME backplane could be disrupted, potentially leading to system malfunction. In a redundant system, the backup communication path would take over, ensuring uninterrupted operation.