Mitsubishi Electric Melsec Q Series User Manual page 82

3
SPECIFICATIONS
Item Bit
Requesting transmission of parameters from DP-
b0
Slave
b1 Diagnostic information read request
b2 0 (Fixed)
b3 The DP-Slave is monitored by the watchdog timer.
Status 2
b4 The DP-Slave entered FREEZE mode.
b5 The DP-Slave entered SYNC mode.
b6 0 (Reserved)
Excluded from I/O data exchange according to the
b7
parameter settings
b8 Unable to exchange I/O data with DP-Slaves.
b9 The DP-Slave is not ready to exchange I/O data.
The parameter (No. of I/O bytes) received from the
b10
Status 1
DP-Master does not match that of the DP-Slave.
b11 There is some extended diagnostic information.
The function requested by the DP-Master is not
b12
supported.
b13 Illegal response from DP-Slave
b14 Illegal parameter(s) sent from the DP-Master
b15 Controlled by another DP-Master.
3
- 41 3.4 Buffer Memory
3.4.6 Diagnostic information area
(b) Information of status 1 and 2
The diagnostic information generated on DP-Slaves is stored to status 1 and 2,
and corresponding bits turn ON (1).
I/O data exchange between a DP-Master and DP-Slaves is continued even if any
of the following errors occurs.
The following table lists the meaning of each bit, actions to be taken, and the
station where the diagnostic information is detected.
Table3.17 Diagnostic Information
Description Action
(1) When I/O data exchange is started
Normally operating (This occurs every time I/O
data exchange is started.)
(2) While I/O data are exchanged
Check the DP-Slave status and
communication line.
Check the DP-Slave status.
Normally operating
Normally operating
Normally operating
(1) When I/O data exchange is stopped
Normally operating(This occurs every time I/O
data exchange is stopped.)
(2) While I/O data are exchanged
Check if any parameter has been changed
from the DP-Master (Class 2) on the network.
Check the DP-Slave status and communication
line.
Check the parameters.
(1) When I/O data exchange is started
Normally operating (This occurs every time I/O
data exchange is started.)
(2) While I/O data are exchanged
Check the DP-Slave status and
communication line.
Check the slave parameters.
Check the DP-Slave status.
Check if the DP-Slave supports the global control
function or not.
Verify the DP-Slave specifications.
Check the DP-Slave or network status.
Check the parameters.
Check if more than one DP-Master are
communicating with the same DP-Slave.
Check the parameters.
Detected in
DP-Slave
DP-Slave
DP-Slave
DP-Slave
DP-Slave
DP-Master
DP-Master
DP-Slave
DP-Slave
DP-Master
DP-Slave
DP-Master
DP-Slave
DP-Master