Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual - Manual (Page 155)

Publication 1760-UM003A-EN-P - September 2005
Glossary 3
Bus cycle time
Time interval in which a master provides services to all slaves or
nodes of a bus system, i.e. writes data to their outputs and reads
inputs.
Byte
A sequence of 8 bits
Code
Data transfer format
COS I/O connection
COS (Change Of State) I/O connections are used to set up
event-controlled connections, i.e. the DeviceNet devices automatically
generate messages when a status has changed.
2 byte diagnostics data of the control relay
Coupling module status
CPU
Abbreviation for “Central Processing Unit“. Central unit for data
processing. Represents the core element of a computer.
Cyclic I/O connection
Message triggering is timer-controlled when operating with a cyclic
I/O connection.
Device Heartbeat Message
A DeviceNet unit can use the Device Heartbeat Message function to
broadcast its native status at set time intervals. These messages are
configured in the Identity Object.
Device Shut Down Message
A device shutting down due to internal errors or states can log off at
the programmable controller by means of the Device Shut Down
Message.
Digital
Represents a value that can acquire only definite states within a finite
set, e.g. a voltage. Mostly defined as "0" and "1".