Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 118)

118 Publication 1753-UM001C-EN-P - March 2010
Chapter 13 Controller Configuration and Modes of Operation
4. Set the controller parameters based on the information the table
below.
IMPORTANT
The safety time you specify must meet the needs of the
controlled process. See the GuardPLC Controller Systems
Safety Reference Manual, publication
1753-RM002 .
For this parameter Specify
System ID (SRS) the system ID of the controller.
The system ID is a component of the SRS (System, Rack, Slot), and can be in the range of
2…65535. The programming terminal uses the system ID to communicate with the controller. The
purpose of the SRS is to match a routine to a specific resource and guarantee that only a routine
with a matching SRS can be downloaded to a resource.
The system ID of the controller should not be set at 1 because 1 is the default system ID for the
programming terminal.
IMPORTANT: The SRS set in the configuration is compiled in the routine.EXE file and must match
the SRS of the GuardPLC controller for a routine to be correctly downloaded to the GuardPLC
controller. A different system ID results in an Invalid_Configuration error during download.
IMPORTANT: The default SRS of a new controller is 60000. You must use this to establish
communication with the controller the first time. Once you establish communication, you can
change the SRS.
Safety Time (ms) the safety time (in milliseconds) for the controller.
The safety time is the time:
•
the controller must react to an input signal with an output signal.
•
within which the controller must react to an error.
The default safety time is 2 times the default watchdog time. You can specify any time from
20…50000 ms.
Watchdog Time (ms) the maximum amount of time (in milliseconds) that the controller can take to execute one cycle.
The watchdog time must be:
• ≥
10 ms.
• ≤
0.5 x Safety Time (Worst case, two cycles must occur within the Safety Time. Therefore,
Safety Time
÷
2 is the maximum watchdog time.).
•
no more than 5000 ms.
The default watchdog time is:
•
500 ms for GuardPLC 1200 and GuardPLC 2000 controllers.
•
50 ms for GuardPLC 1600 and GuardPLC 1800 controllers.
•
10 ms for 1753-IB16, 1753-IB20XOB8, 1753-OB16 modules.
If the controller exceeds the watchdog time, the controller goes into Failure_Stop.