CS7X™ Control System Controller Area Network (CAN)

CAN technology was developed for mission critical applications. In the CS7X system, it provides highly secure and reliable communications between the PCM and the controller area network operations node (CANON) module I/O sub system. It offers high-speed communication rates up to 1-Mb per second. In addition, the error confinement and detection features make it more reliable in noise critical environments.

CAN is used for communications between PCM(s) and I/O boards within a local module. Adding additional I/O is simply a matter of plugging in another I/O module. The personality card of the added I/O module communicates with the PCM and becomes an active module with its own address and configuration.

In a hierarchical system, the CAN interface to each CANON module and sub-level PCM is global across the system allowing data sharing with fast response times. Each CANON module has a unique address and data structure allowing for hot replacement and auto configuration for field replaced or new modules. CANON modules can be packaged either for 19” rack mount on 6U cards or DIN rail mount.

Each CANON module consists of a termination board, a personality card, and a brain board. The termination and brain boards are common to all I/O types. The personality card is I/O specific for each type of module (i.e. Ain, Aout, Din, Dout).

Standard features of CANON modules are:

• Redundant CAN ports on all modules
• Hot pluggable on CAN network
• Auto configuration of new or field replaced modules and synchronization into the system
• Time tagged data stamping to 2-mSec
• Time synchronization (system wide) to 1-mSec resolution for clock synchronization
• Event driven communications to PCM, continuous I/O polling is not required
• Change of status reporting to PCM, updates change of status within 1-mSec