231 Publication 1752-UM001A-EN-P - October 2006
Glossary
assembly
Internal data in a device gathered as one group to be accessed
externally.
busoff
Status that occurs when the error rate is extremely high over a
communications cable. An error is detected when the internal error
counter exceeds a threshold value.
change of state (COS)
A type of standard I/O communication in which the controller can
send and receive data with slave devices whenever a data change
occurs in the configured slave device or controller. Data is updated at
the rate of the heartbeat.
configuration signature
The combination of an ID number, date, and time that uniquely
identifies a specific configuration for a device.
cyclic
A type of standard I/O data communication in which the controller
can send and receive data with slave devices that support the cyclic
feature. Data is only sent at the user-specified rate.
discrepancy time
The time period from a change in one or two inputs until the other
input changes.
Dual Channel
The use of two inputs or outputs as the input or output for
redundancy.
Dual Channel Complementary
A setting to evaluate whether two logic states are complementary.
Dual Channel Equivalent
A setting to evaluate whether two logic states are equivalent.
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