Toshiba GR-200 Series Instruction Manual page 433

Common controls (CMNCTRL)
The CMNCTRL is served as a mediator to provide a bridge between functions.
Double command blocking (DCB)
3.8.1
For control functions, the operating principle is that priority is given to the first command
received and shall be executed first. In other words, successive commands received do not have
the right to run until the first command received has failed to complete its operation (that is,
the principle of double command blocking (DCB) is established). The principle is significant for
protection and control devices in the sub-station†. Figure 3.8-1 illustrates how each control
function generates a SLD_RPT signal; the aggregation of SLD_RPT signals is performed in the
CMNCTRL1 function. The resultant signal is output at PLC connection point "DCB SND OR".
The resultant signal is returned to the respective control function as feedback.
"From 61850
communication
"stVal" message 2
DPOS function
Figure 3.8-1 DCB operation in CMNCTRL1 function
†Note: Let us assume that the control function in IED-1 controls CB1, as shown in Figure
3.8-2. IEDs -2 to -10 are forbidden to operate their CBs throughout the period that
IED-1 is in operation.
In Figure 3.8-1, the CMNCTRL1 function generates a message denoted with the number
1; Figure 3.8-2 exemplifies that the IED-1 generates the "stVal" message 1. In addition, IEDs-
2 to -10 are also required to receive message 1, this is denoted with the number 2. For
IEC61850 communication, the "stVal" messages 1 and 2 are carried by GOOSE publish and
GOOSE subscribe. Thus, for all IEDs (i.e., IED-1 to IED-10 of Figure 3.8-2), it is required to
set the GOOSE publish destination corresponding to the message.
510001 0001011001
DCB RCV OR
Reception of "DCB"
Output of "StSeld"
DPOS01_STD_RPT
DPOS01 function
DPOS72 function
DPOS72_STD_RPT
- 414 -
CMNCTRL1 function
≥1
To 61850
communication
DCB SND OR
(510001 0008001F42)
6F2T0200 (0.15)
"stVal" message 1
To control functions
in its own
GRE200 (1,2)