Rockwell Automation 1785 PLC-5 User Manual download pdf (Page 120)

1785-UM022C-EN-P - February 2008

D-2 ControlNet I/O Map-Entry Status Words and Error Codes

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.

10 Data Underrun This bit it set whenever the length of data received for the associated connection is smaller

than expected. The Data Invalid Bit will also set if the length of data received is less than the

value configured in the Input Data Size field for the connection in RSNetworx.

11 Data Overrun This bit it set whenever the length of data received for the associated connection is larger than

expected. The Data Invalid Bit will not be set.

15 Run Mode This bit it set to give the Run/Idle status of the target device for connections that support

Run/Idle notification (such as Peer-to-Peer Receive Data connections).

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Rockwell Automation 1785 PLC-5 User Manual Page 120

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