Manual

Operating Characteristics 3-7
Table 3-3 Control States
Value State
1 Off-Line/Equipment Off-Line
2 Off-Line/Attempt On-Line
3 Off-Line/Host Off-Line
4 On-Line/Local
5 On-Line/Remote
GWGEM SW maintains the GEM Control State finite state machine
([RefGWGEMUser] p. 93 Remote Control).
FmNT is responsible for the following ([ RefGWGEMUser] p 99 ‘Other Control
State Considerations’):
 Providing a Process Control State Change extension routine ([RefGWGEMRef]
NoteControlState).
 GUI display of the current State.
 Provide operator commands for Go Local and Go Remote.
 When ControlState is LOCAL, reject remote commands appropriately.
 When ControlState is REMOTE, reject local commands appropriately, and call
GemNoteEvent to signal the OperCmd Event.
The current Control State is displayed in the GEM status bar in lower portion of all
windows except the Run Window. In Remote State configuration, teaching, and tools
features are not available to the operator. This prevents the operator form interfering
with Remote operations.
3.2.1 Control Finite State Description
The Control State of the Equipment is illustrated in the Equipment Control State
Diagram on the following page. The GES-1993 behaves differently and will accept
different messages depending on its current control state. The purpose of this
diagram is to make clear to the Host exactly what is happening at the Equipment.
The logic for these states and transitions is the logic specified in the GEM standard.