Honeywell 621-2150 Digital Output Board 115V AC 16-pt I/O PLC Module

Honeywell 621-2150 Digital Output Board 115V AC 16-pt I/O PLC Module

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Each 1/0 slot is normally set for the type of 1/0 module to be installed in the slot (i.e. 8 addresses assigned to a slot that will contain an 8-point I/0 module). Slots can be set for more addresses than the installed module (i.e. 32 addresses assigned to a slot that will contain a 16-point module). Zero can be assigned to a slot when necessary as for double width modules.

A Control Network is a high speed peer-to-peer communications system in which as many as eight PCs can share I/0 status over a serial link. Field startup time is greatly reduced using this communication method since it eliminates wiring I/0 between PCs.

The Control Network Module (CNM) connects to the processor bus and allocates 256 I/0 status bits or 16 registers for its use. These status bits or registers are designated for receiving I/0 status or data from other 620 processors on the network. The CNM also transmits processors I/0 status (32 or 64 bits) to other 620 processors on the link. All eight CNMs on a Control Network are serviced within 18rns.

The link is a single twisted pair cable with a maximum length of 4000 feet. If the optional twinaxial cable is used, the maximum cable length is expanded to 8000 feet. Control Network Modules are connected to the link in a multi~rop configuration.