PACSystems VersaMax Genius Network Interface User Manual Section 3
GFK-1535D Jan 2023
Operation 54
3.5 Operation of the Genius NIU in Enhanced
Diagnostics Mode
Genius NIUs that are version -GJ or later have a configurable Enhanced
Diagnostics Mode feature. PAC Machine Edition version 5.6 SIM 8 or later
is required to configure the new mode. When used in the safety-relevant
portion of a GMR system, the GNIU’s Enhanced Diagnostics Mode must
be enabled.
When Enhanced Diagnostics Mode is enabled, the operation of the Genius
NIU changes as described below.
•
The Genius NIU turns on its BUS B/EDM LED. The color of this LED is
amber.
•
The Genius NIU continuously executes extensive diagnostic tests in
the background. These diagnostics cause the GNIU to be more
sensitive to disturbances on the Genius bus. When a Genius bus
disturbance or spontaneous hardware failure causes a diagnostic test
to declare an error, the GNIU stops communicating on the Genius
bus and attempts to reset itself. The loss of communications causes
the host PLC(s) to log a Loss of Device fault and default the affected
inputs (according to the host’s configuration). GMR PLCs will
disregard the channels associated with that GNIU. If the GNIU can
revive itself, it tries to resume normal operation several seconds later.
If this is successful, the host PLC(s) will log an Addition of Device fault.
For the case of a GMR PLC, an operator must issue a GMR I/O Reset
command (%M12258) to recover the use of those input channels.
•
The GNIU’s sweep time is larger. See “GNIU Sweep Times for
Enhanced Diagnostics Mode” later in this section.
•
The GNIU reports a Loss of Device fault for failed modules
immediately after detecting an error, instead of freezing the inputs
and delaying the fault for 1.25 seconds.
•
The following datagrams are not permitted: Write Configuration,
Force I/O, Unforce I/O, Switch BSM, Force BSM, and Unforce BSM.
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