The GIC display shows the status of the GuardLogix controllers as well as the status of the main permissive signals that are controller by the GIS. The six controllers that make up the GIS are shown in columns.
The first row displays the name of the controller. These show which controller is associated with which subsystem.
The second row displays the status of communications from the HMI to the controller. The standard should be “is present.” If not check power and communications path.
The third row reports the status of the controller. Generally, this will be “OK”. If the status is “Faulted” then the controller has encountered a major fault. For further troubleshooting RSLogix will have to connect to the controller and examine the controller properties to determine the exact nature of the fault.
The fourth row displays the position of the key switch on the front panel of the controller and the mode that has been selected. Possible responses are “Run”, “Program”, “Remote Run”, or “Remote Program”. The system should normally be in “Run” or “Remote Run”. If “Remote Program” is displayed, RSLogix will have to connect to the controller and switch controller to run mode. If “Program” is selected then the key switch will have to be changed to either “Run” or “Remote.”
The fifth indicates the status of the controller’s safety lock. Normally this should be Safety Locked. If it is not, determine why it is not before proceeding with operations.
The sixth row displays the safety signature (or in the case of an L8xES processor just part of the safety signature). The background is yellow if the current safety signature does not match the safety signature that was last stored in the HMI. This doesn’t mean it is the wrong signature, just the safety signature has been changed recently or the proper safety signature was not stored.
The seventh row displays the value of the accuracy of the local clock to parent clock. This is not the offset to the grandmaster clock.
The eighth row indicates if communications between the controller and its configured I/O is working properly. There are four possible states: “OK”, “Partial”, “None”, and “Not configured.” Anything other than “OK” indicates that troubleshooting should take place to understand the reason for the loss of communications. A partial loss of communications should not adversely affect safety, although it will likely result in some loss of functionality.
The ninth row displays that status of safety instructions associated with that controller. Normally, no safety instruction faults should be present. However, safety instruction faults should not adversely affect safety, although it will likely result is some loss of functionality. First step to recovery is to attempt a GIS reset. This will clear many safety instruction faults but not all of them.
The tenth row displays the status of the emergency stop system associated with that controller. Normally, this should be “OK”. If an E-Stop has been trigger it must be corrected before any operations can take place. This indicator as serves as a navigation button that will take the user to the status display for that subsystem’s emergency stop devices.
The rest of the indicators on this page display the status of one of the major components of the telescope such as Coudé Azimuth Axis, Telescope Altitude Axis, Telescope Azimuth Axis, Enclosure Altitude Axis, Enclosure Azimuth Axis, and the Aperture Cover. These indicators function as navigation buttons as well. In addition there are indicators for the Gregorian Optical System (GOS) and Instrument permissive signals.