Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 448

APPENDICES
No. Name
SB0007 Clear forward loop
(7) transmission errors
SB0008 Clear reverse loop
(8) transmission errors
6
SB0009 Clear loop switch count
(9)
SB000A Clear transient
(10) transmission errors
SB000B Transient transmission
(11) error area setting
3 4
SB000F Clear minor errors
(15)
SB0011 Data link operation
(17) designation
Remote sub-master
SB0014
station switching
(20)
command
System switching
SB0018
monitoring time setting
(24)
valid flag
SB0020
Module status
(32)
SB0040 Network type
(64) (host)
Host station's redundant
SB0041
function support
(65)
information
SB0042 Power supply status of
(66) host
6: The SB0009 must be kept on until the SW00CE becomes "0."
App - 9
Table 3 Link special relay (SB) list (continued)
Description
Clears the line abnormal detection (SW00CC) of the forward loop
side to 0.
Off: Clear not instructed
On: Clear instructed (valid when on)
Clears the line abnormal detection (SW00CD) of the reverse loop
side to 0.
Off: Clear not instructed
On: Clear instructed (valid when on)
Clears the loop switch count (SW00CE to SW00E7) to 0.
Off: Clear not instructed
On: Clear instructed (valid when on)
Clears the transient transmission errors (SW00EE, SW00EF) to
0.
Off: Clear not instructed
On: Clear instructed (valid when on)
Designates whether to overwrite or retain the transient
transmission errors (SW00F0 to SW00FF).
Off: Overwrite
On: Retain
Clears all of the minor errors detected by remote I/O stations.
This is executed on all the remote I/O stations.
While SB000F is ON, any minor error is not detected on all of the
remote I/O stations.
On multiplexed remote I/O networks or redundant multiplexed
remote I/O networks, this can be operated only from the master
station.
Off: Clear not instructed
On: Clear instructed (valid when on)
Designates the data link operation.
Off: No switch instruction
On: Switch instruction (valid when on)
When On is detected, data link switches from Online (normal
data link) operation to Online (debug) operation, or from Online
(debug) operation to Online (normal operation).
ON
OFF OFF
SB0011
Debug operation
Forcibly directs the remote sub-master station that is performing
master operation to shift to sub-master operation. (It is invalid for
the redundant system.)
Off: Without directive
On: With directive
Indicates whether the system switching monitoring time setting
(SW0018) is valid or invalid in case of a data link error.
Off: Invalid
On: Valid (valid at the time of startup)
Indicates the communication status between the network module
and CPU module.
Off: Normal
On: Abnormal
Indicates the network type set with the parameters of the host's
network module.
Off: PLC to PLC network
On: Remote I/O network
Indicates the station supports the redundant function or not.
Off: Redundant function not supported
On: Redundant function supported
Indicates the external power supply status to the host's
QJ71LP21S-25. (When using QJ71LP21-25, 0 is ON.)
Off: Not supplied (EXT.PW LED is OFF.)
On: Supplied (EXT.PW LED is ON.)
ON ON
OFF
Debug operation
Online operation
[Availability column] Loop: optical loop, Bus: coaxial/twisted bus
MELSEC-Q
Use permitted/prohibited
Remote
Control Normal
master
station station
station
Loop Bus Loop Bus Loop
: Available,
Remote I/O
station
Bus Loop Bus
: Not available
App - 9