Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 77

Manual switch
While a submaster station is operating as a master operating station, the operation of the master station can be switched from
the submaster operation to the master operation with the procedure described below. Note, however, that this does not apply
when the master station is operating as a master operating station. Cyclic transmission is continued during switch. (The
output of the slave station is held during switch.)
1.
In the submaster station operating as a master operating station, check that 'Forced master switching enable status'
(SB0066) is on. Then turn on 'Forced master switch command' (SB0019).
Whether the submaster station is operating as a master operating station can be checked using the following signals.
• 'Master/submaster function operation status of own station' (SB004E) is off.
• 'Master station information' (SB0070) is on.
2.
When the master/local module receives a switch command, 'Forced master switching acceptance status' (SB0067) is
turned on, and the switch is started.
Cyclic transmission is continued during switch.
3.
When the switch is completed, 'Forced master switching operation status' (SB0068) is turned on.
4.
The result can be checked in 'Forced master switching command result' (SW005C).
5.
Turn off 'Forced master switching command' (SB0019).
'Forced master switching acceptance status' (SB0067), 'Forced master switching operation status' (SB0068), and 'Forced
master switching command result' (SW005C) are turned off.
■Sample program of a manual switch
Classification Label name
Module label GF11_1.bReq_MasterSwitch
GF11_1.bOpe_Submaster
GF11_1.bVal_MasterSwitch
GF11_1.bAcpt_MasterSwitch
GF11_1.bCompl_MasterSwitch
GF11_1.bOpe_DataLinkbySubmaster
GF11_1.bSts_BatonPassError_Master
GF11_1.bSts_DataLinkError_Master
GF11_1.uRslt_MasterSwitch
Label to be defined Define global labels as shown below:
(0) Pulsing the switching command
(5) Switching command
(16)Processing upon normal completion or abnormal end of the switch
Description
Forced master switch command
Master/submaster function operation status of own
station
Forced master switching enable status
Forced master switching acceptance status
Forced master switching operation status
Master station information
Baton pass error status of master station
Data link error status of master station
Forced master switching command result
1.6 Submaster Function
1
Device
SB0019
SB004E
SB0066
SB0067
SB0068
SB0070
SB00A1
SB00B1
SW005C
1 FUNCTIONS
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