IC698CMX016 modular

IC698CMX016 modular
The Control Memory Xchange (CMX) module provides deterministic sharing of data among PLCs and
other computing devices on a high-speed fiber optic network, using reflective memory technology. A
reflective memory network can contain up to 256 nodes. Each node in the network can be any reflective
memory device that is compatible with the 5565 family. When data is written to one node, all nodes on the
network are automatically updated with the new data.
Each node in the reflective memory network is connected in a daisy-chained loop using fiber optic cables.
The transmitter of the first node is tied to the receiver of the second. The transmitter of the second node is
tied to the receiver of the third node, and so on, until the loop is completed back at the receiver of the first
node. The figure on page 3 shows an example of a six-node reflective memory network.
A PACSystems RX7i main rack supports a maximum of four Memory Xchange modules.
Features
■ PACSystems RX7i single slot form factor.
■ 16 Mbytes reflective memory with parity.
■ Software configuration of all node parameters (no jumper or switch settings required).
■ High-speed easy-to-use 2.12 Gbaud fiber-optic network.
■ No RX7i CPU processing required to operate the network.
■ Network-compatible with VMIC 5565 family of reflective memory devices.
■ Connection with multimode fiber up to 300m/984.25ft.
■ Dynamic packet sizes of 4 to 64 bytes, controlled by the Memory Xchange module.
■ Maximum network transfer rate of 43 Mbyte/s (4 byte packets) to 174 Mbyte/s (64 byte packets)
■ Programmable VMEbus interrupt output.
■ Four general-purpose network interrupts with 32 bits of data each.
■ Network error detection.
■ Up to 256 nodes per network.
■ Redundant transfer mode operation. This optional mode reduces the chance of a data packet being
dropped from the network.
■ Configurable network memory offset allows you to assign nodes on a network to groups according to
the 16MB segment in the network address space that they use.