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Mitsubishi Electric QJ71DN91 User Manual Page 53

Melsec q series, devicenet master-slave module.
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3 SPECIFICATIONS
3 - 27
(2) Error Information for Master Function (address: 01B1
A code for a communication error occurred in the master function is stored.
For error notification and a clearing method of this area, refer to Section 3.3.2 (4).
(a)
High byte
An error code is stored. (Refer to Section 10.2.1.)
(b)
Low byte
The number of the node (MAC ID), where an error occurred, is stored.
FE
, FF
(254, 255): Own node (QJ71DN91)
H
H
0
to 3F
(0 to 63): Node No. (MAC ID) of the slave node where an error
H
H
occurred.
POINT
If errors occur at multiple nodes, the error information of the node with the smallest
node No. (MAC ID) is stored.
(3) Bus Error Counter (address: 01B2
The number of times that the illegal frame count of the CAN chip (DeviceNet's
communication chip) exceeded 96 is stored.
An increase of this value means that communications are unreliable.
(4) Bus Off Counter (address: 01B3
The number of times that the QJ71DN91 was placed in the bus off status is
stored.
An increase of this value means that communications are unreliable.
/434)
H
/435)
H
MELSEC-Q
/433)
H
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