
B-63404EN/03 OPERATION 1.DeviceNet FUNCTIONS
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When the Devicenet Slave Board (A20B-8100-0490) or Slave Board A(A20B-8100-0491)is used
Table 1.3 (b): Diagnostics information
(STATUS/COMMUNICATIONS STATUS)
Item Description
STATUS: DISABLE : Disables communications.
ENABLE : Enables communications.
(normal communications
status)
ERROR : Communications error has
occurred.
Check COMMUNICATION
STATUS and the status of
the master device.
INVALID MAC ID : The MAC-ID is not set
correctly.
DUPLICATE MAC ID : Duplicate MAC-IDs have
been set.
BUS FAULT : Bus error has occurred.
POWER ON ERROR : An error occurred when
the power was turned ON
or when ENABLE was set.
Check the DeviceNet
interface board mounting
state.
IDLE/ACTIVE Indicates the status of the Group 2 Master/Slave
Connection Set. "01" indicates an active state.
00: IDLE state
(Group 2 Master/Slave Connection Set is not
established.)
01: ACTIVE state
(Group 2 Master/Slave Connection Set is
established.)
CAN BUS STATUS1 Indicates the status information of the CAN
(Controller Area Network) bus. Status information
is expressed in hexadecimal with 1 byte
expressing each item of information. Each of the
bits of the status information is significant.
CAN BUS STATUS1 (1byte Data)
#7 #6 #5 #4 #3 #2 #1 #0
[ML] [RO] [TO] [TA] [A] [BO] [BW] [OL]
The meaning of bits is as follows.
(Values in parentheses () indicate values in the
normal communications status.)
#01 OL (1) : Online state
#1 BW (0) : Bus warning state
A communications error has
occurred, and the CAN chip
automatically stopped frame transfer.
Probable causes are an incorrect
baud rate setting or noise.