Rockwell Automation 1756-L7x GuardLogix 5570 Controllers - Manual (Page 117)

Rockwell Automation Publication 1756-UM022A-EN-P - November 2012 117
Monitor Status and Handle Faults Chapter 9
Safety Connections
For tags associated with produced or consumed safety data, you can monitor the
status of safety connections by using the CONNECTION_STATUS member.
For monitoring input and output connections, Safety I/O tags have a connection
status member called SafetyStatus. Both data types contain two bits: RunMode
and ConnectionFaulted.
The RunMode value indicates if consumed data is actively being updated by a
device that is in the Run Mode (1) or Idle State (0). Idle state is indicated if the
connection is closed, the safety task is faulted, or the remote controller or device
is in Program mode or Test mode.
The ConnectionFaulted value indicates whether the safety connection between
the safety producer and the safety consumer is Valid (0) or Faulted (1). If
ConnectionFaulted is set to Faulted (1) as a result of a loss of the physical
connection, the safety data is reset to zero.
The following table describes the combinations of the RunMode and
ConnectionFaulted states.
If a module is inhibited, the ConnectionFaulted bit is set to Faulted (1) and the
RunMode bit is set to Idle (0) for each connection associated with the module.
As a result, safety consumed data is reset to zero.
Monitoring Status Flags Logix controllers, including GuardLogix controllers, support status keywords
that you can use in your logic to monitor certain events.
For more information on how to use these keywords, refer to the Logix5000
Controllers Controller Information and Status Programming Manual,
publication
1756-PM015 .
Table 39 - Safety Connection Status
RunMode
Status ConnectionFaulted
Status
Safety Connection Operation
1 = Run 0 = Valid Data is actively being controlled by the producing device. The
producing device is in Run mode.
0 = Idle 0 = Valid The connection is active and the producing device is in the Idle state.
The safety data is reset to zero.
0 = Idle 1 = Faulted The safety connection is faulted. The state of the producing device is
unknown. The safety data is reset to zero.
1 = Run 1 = Faulted Invalid state.