Rockwell Automation 1753-DNSI DeviceNet Safety Scanner for GuardPLC Controllers - Manual (Page 123)

Publication 1753-UM002A-EN-P - July 2005
Glossary 3
Scanlist
The list of devices (nodes) with which the scanner is configured to
exchange I/O data.
Scanner ID
A read-only value which uniquely identifies the scanner and is
required to connect the GuardPLC controller to the scanner. The
scanner ID is automatically generated by RSNetWorx for DeviceNet
using the SNN and DeviceNet address of the scanner.
Scanner Signals File
A file which defines the layout of the data passed via HSP, including
signals and the HSP Signature value.
SRS (System, Rack, Slot)
See Controller ID.
Strobed
A type of standard I/O data communication in which a message
solicits a response from each strobed device (a multi-cast transfer). It
is a 64-bit message that contains one bit for each slave device on the
network.
Each slave node can return a maximum of 8 bytes in response to the
master’s strobe.
System Reaction Time
The worst case time from a safety-related event as input to the system
or as a fault within the system, until the time that the system is in the
safety state. System Reaction Time includes sensor and activator
Reaction Times as well as the Controller Reaction Time.
Target Connections File
A file used to pass target connection information for data the user
wants to make available from the GuardPLC controller to another
safety originator or standard master on the DeviceNet network.
Timeout Multiplier
This value determines the number of messages that may be lost before
declaring a connection error.