Products Description
Control Network, Cnet, is a high-speed data communication highway between nodes in the Symphony™ Enterprise Management and Control System. Cnet provides a data path among Harmony control units (HCU), human system interfaces (HSI), and computers. High system reliability and availability are key characteristics of this mission-critical communication network. Reliability is bolstered by redundant hardware and communication media in a way that the backup automatically takes over in the event of a fault in the primary. Extensive use of error checking and message acknowledgment assures accurate communication of critical process data.
Harmony rack communications encompasses various communication interfaces: Cnet-to-Cnet, Cnet-to-HCU, and Cnet-to-computer. Communication modules, in certain combinations, create the various Cnet communication interfaces.
The DSI consists of a single printed circuit board that occupies one slot in a Module Mounting Unit (MMU). It monitors two separate groups of eight digital inputs. Twelve inputs are isolated from each other; the remaining two pairs share common positive input lines. Two captive screws on the module faceplate secure it to the MMU. Sixteen front panel LED status indicators (group A and group B) display the input status.
The slave module has three card edge connectors for external signals and power (P1, P2 and P3). P1 connects to common (ground) and +5 VDC power (refer to Table 5-1). P2 connects the module to the slave expander bus to communicate with a master module (refer to Table 5-2). The digital signals are input through connector P3 using a cable connected to a Termination Unit (TU) or Termination Module (TM) (refer to Table 5-3).
The terminal blocks (physical connection points) for field wiring are on the TU/TM.
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