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Glossary 7
7 Glossary
Term Description
idle data Data sent when the originating application is in an inexecutable state.
assembly Internal data in a device gathered as one group to be accessed externally.
safety data Data with high reliability.
error latch time The time period to hold an error state (control data, status data, and LED indi-
cations).
open type The open method for Safety Connection. One of three types is selected in the
settings of a connection to the Safety Master.
connection A logical communications path used to communicate between devices.
configuration The settings for a device and a network.
single channel Using only one input or output as the input or output.
standard A device or device function to which safety measures are not applied.
safety controller (safety PLC) A controller with high reliability used for the safety control.
safety chain The logical chain to actualize a safety function, that consists of the input device
(sensor), the control device (including a remote I/O device), and the output
device (actuator).
safety protocol The communications hierarchy added to actualize highly reliable communica-
tions.
safety signature A certificate of the configuration data issued to a device from the Network Con-
figurator. The device verifies that the configuration data is correct by using the
safety signature.
test pulse A signal used to detect external wiring coming into contact with the power sup-
ply (positive) or short circuits between signal lines.
dual channel Using two inputs or outputs as the input or output for redundancy.
Dual Channel Complementary Setting to evaluate that two logic states are complementary.
Dual Channel Equivalent Setting to evaluate that two logic states are equivalent.
Busoff Status that occurs when the error rate is extremely high over a communica-
tions cable. An error is detected when the internal error counter exceeds a cer-
tain threshold value. (The internal error counter is cleared when it is started or
restarted.)
DeviceNet Safety A safety network that adds a safety protocol to DeviceNet to comply with
IEC61508 SIL3, EN954-1 Safety Category 4.
discrepancy time The time period from a change in one of two inputs until the other input
changes.
EPI The interval of safety data communications between the Safety Master and the
Safety Slave.
multi-cast connection Safety I/O communications in a 1:n configuration (n = 1 top 15).
single-cast connection Safety I/O communications in 1:1 configuration.
TUNID The UNID of the local node. Usually the TUNID is set from the Network Config-
urator.
UNID A identifier to specify one device in all the network domains. Values combining
the network address and the node address are used.
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