Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 129)

Chapter
Starting the Scanner
7
7Ć3
The following table describes each scanner state.
In this state: the scanner enters this state:
POST at powerĆup, as a result of a VME SYSRESET, or as a result of the RESET command.
In this state the scanner executes its selfĆtest. The scanner ignores all commands or
interrupts from VME processors and ignores all packets from the I/O link.
If the selfĆtest completes successfully, the scanner initializes global memory and sends
status to the operating status word. In SVĆcompatible and SVĆsuperset modes, the scanner
enters the SLEEP state.
If the scanner enters POST state from a VME SYSRESET or a RESET command, the
selfĆtest preserves the contents of the I/O image tables.
DEAD when the selfĆtest detects irrecoverable hardware faults.
The scanner asserts VME SYSFAIL, enters an infinite loop, and ignores all commands or
interrupts from VME processors and ignores all packets from the I/O link.
Cycle power to leave the DEAD state.
SLEEP when the selfĆtest completes successfully and the scanner is in SVĆcompatible or
SVĆsuperset mode.
In the SLEEP state, the scanner ignores all packets from the I/O links. The scanner doesn't
leave this state until the VME master processor writes any value to the scanner
interrupt/VME ID area. Then the scanner enters the PROGRAM state.
PROGRAM when the scanner leaves the SLEEP state or when the scanner (in TEST or RUN state)
receives a SET MODE command.
In the PROGRAM state:
• the scanner doesn't send output information to the adapters
• all module outputs are held reset (off)
• discrete input information is updated
• the scanner doesn't send block transfer requests to the adapters, but the scanner will
queue the requests from the VME master processor
TEST when the scanner (in PROGRAM or RUN state) receives a SET MODE command.
In the TEST state:
• the scanner sends output information to the adapters
• all module outputs are held reset (off)
• discrete input information is updated
• the scanner sends block transfer requests to the adapters, but actual outputs are held
reset (off)
RUN when the scanner (in PROGRAM or TEST state) receives a SET MODE command.
In the RUN state:
• the scanner sends output information to the adapters
• input information is updated
• the scanner sends block transfer requests to the adapters
• all outputs are allowed to energize
SYSFAIL when the VME SYSFAIL monitor is enabled and SYSFAIL is asserted.
In the SYSFAIL state, the scanner places a failure code in the confirmation status word,
lights the Fault indicator, and enters a program loop waiting for a RESET command. The
scanner ignores all other commands or interrupts from VME processors and ignores all
packets from the I/O link.
When the scanner receives a RESET command, it enters the POST state.