User manual

Troubleshooting
Extended Local I/O 5-33
Troubleshooting
Extended Local I/O 5-33
The following table explains the bits in the first word of the ControlNet I/O status file:
Bit Number Description Use
00 Reset Bit Set this bit to put the associated connection into PROGRAM mode, even if the processor is in Run mode.
Clear this bit to set the mode of the associated connection according to the processor’s mode.
This bit has no effect for 1771 block transfer modules.
01 Inhibit Bit Set this bit to perform an orderly shutdown of the associated connection. If the target node is a ControlNet adapter, the
adapter will go into idle mode. The processor will not attempt to reopen the connection as long as this bit is set. The
processor will also set the Data Invalid Bit and Connection Error Bit.
Clear this bit to allow the processor to attempt to open the associated connection.
02 PCSC Enable Bit Set this bit to enable Process Control Sample Complete for the associated I/O map entry.
Clear this bit to disable Process Control Sample Complete for the associated I/O map entry.
03 PCSC New Data Bit The processor sets this bit when the PCSC Enable Bit is set and new data arrives from the associated connection.
Clear this bit when you are finished processing the current sample of data.
04 PCSC Overflow Bit The processor sets this bit when the PCSC Enable Bit and the PCSC New Data Bits are set and new data arrives from the
associated connection. This means that PCSC data is arriving faster than your ladder program is processing it.
Clear this bit after you modify your ladder program to handle the incoming PCSC data.
05 Immediate Inhibit Bit Set this bit to immediately stop communicating on the associated connection. This has the same effect as if you
disconnected the target node from the ControlNet network. If the target node is a ControlNet adapter and the adapter is setup
for Processor Restart Lockout, the adapter will go into Processor Restart Lockout mode. The processor will not attempt to
reopen the connection as long as this bit is set. The processor will also set the Data Invalid Bit and Connection Error Bit.
Clear this bit to allow the processor to attempt to open the associated connection.
08 Data Invalid Bit The processor sets this bit when data is not received from the associated target node. The error code in second and third
words of the ControlNet I/O status tells you why the data is invalid. Also, if either the Inhibit Bit or Immediate Inhibit Bit is set,
the Data Invalid Bit will be set.
The processor clears this bit when valid data is received from the associated target node. In your program, make sure that
this bit is clear before you use the associated data.
09 Connection Error Bit The processor sets this bit when the associated connection is not made to the target node. The error code in second and third
words of the ControlNet I/O status tells you why the connection is not made. Also, if either the Inhibit Bit or Immediate Inhibit
Bit is set, the Connection Invalid Bit will be set.
The processor clears this bit when the associated connection is made to the target node.
ControlNet I/O Status