Allen-Bradley devicenet modules in logix5000 control systems Manual Do Utilizador

Publication DNET-UM004A-EN-P - March 2004

7-4        Control a Device

count of I/O scans

10

ScanCounter

DINT

indication that a device has failed:

• There is 1 bit for each address on the DeviceNet network (0 -63).

• The position of a bit = address of a device.

• If a bit = 1, then the device at that address has failed.

DeviceFailureRegister

SINT[8]

indication that the data size of a device does not match the amount of 
memory allocated for the device in the scanner:

• There is 1 bit for each address on the DeviceNet network (0 -63).

• The position of a bit = address of a device.

• If a bit = 1, then their is a mismatch with that address.

AutoverifyFailureRegister

SINT[8]

indication that a device is idle:

• There is 1 bit for each address on the DeviceNet network (0 -63).

• The position of a bit = address of a device.

• If a bit = 1, then the device at that address is idle.

DeviceIdleRegister

SINT[8]

indication that a device is online:

• There is 1 bit for each address on the DeviceNet network (0 -63).

• The position of a bit = address of a device.

• If a bit = 1, then the device at that address is online.

ActiveNodeRegister

SINT[8]

ASCII representation of scanner status/display

StatusDisplay

SINT[4]

address of the scanner

11

ScannerAddress

SINT

status code of scanner

ScannerStatus

SINT

address with an error:

• scrolls through the addresses with errors

• ScrollingDeviceStatus member shows the status code

ScrollingDeviceAddress

SINT

status code of an address with an error:

• scrolls through addresses with errors

• ScrollingDeviceAddress member shows the address

ScrollingDeviceStatus

SINT

possible future expansion of the structure – 5 DINTs

16

status code of lower 32 devices – 1 byte per device

24

DeviceStatus

SINT[32]

status code of all devices – 1 byte per device

32

DeviceStatus

SINT[64]