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LINE SECTIONALIZING USING A PLC AND ABB PROTECTIVE RELAY
Figure 49. Segment 3 Network 20 – Read PCD Status Information or FIFO Instruction
Segment 3 Networks 21 through 30
As the previous networks 11 through 20 only data access instructions were programmed in the device.
Networks 21 through 30 perform control instructions. As illustrated in the DPU2000R Automation Manual
and the PCD2000 Modbus Protocol documents, the procedure for performing control is to write a group of
registers parameterizing the control (usually writing 5 consecutive registers) and then writing one single
register with the execute command (usually 1) and send it to the relay within 100 seconds of the
parameterization commands. As illustrated in Figures 51 through 60, the procedure to do this is shown in
Figure 50.
40308 = Coommand Word
40309 =Message Pointer (355)
40310 = Buffer Length (5 Fixed by Modbus)
40311 =Response Timeout ( mS)
40312=Retry Limit
40313 =Start of TransmitDelay
40314 =End of Transmit Delay
40315 =Current Retry Count
#0001
40300
XMIT
16
40309 = TRANSER COMMAND TO 40355
40310 = 5 Registers
40355 = Modbus Function Code
40356 = Quantity of Register Read/Written
40357 = DPU or PCD Address
30
40358 = DPU/PCD Data Address to Read or Write
40359 = 0X or 4X data address in PLC
Registers
40360= Data Area to Store for WRITE instructions
40384=
READ DPU STATUS
CYCLIC
POLL
(40330
counter)
to placeDPU/PCD data read
or address to obtain data to write to DPU/PCD
Figure 50. Write Ladder Logic Methodology
Page 27 of 53
Load
6XXX File 1
611000
600700
Write 1DPU Reg 40360 to PLC41154
611030
600710
Write 5 DPU Regs 40360 to PLC41155
611090
Write5 DPU Regs 40360 to PLC 41155
600720
611120
Write 5 DPU Regs 40360 to PLC 41155
600730
611150
Write 5 DPU Regs 40360 to PLC 1155
600740
611180
600750
Write 5 DPU Reg 40360 to PLC41155
611210
600760
Write 5 PCD Regs 40360 to PLC41155
611240
Write5 PCD Regs 40360 to PLC 41155
600770
611270
600780
Write 5 PCD Regs 40360 to PLC 41155
611300
Write 5 PCD Regs 40360 to PLC 41155
600790
Write 5 PCD Regs 40360 to PLC 41155
611330
600800
611360
Write 1 PCD Regs 40360 to PLC 41154
600810
611390
600820
611420
600830
Parameterize the
XMIT Block
Regs 40308 to
40 315
COUNTER
6XXX File 2
Data Constant for write 0001 h
PTR 20
PCD WRITE TRIGGER
Data for Write 5 ConstanstsDPU
TRIP
PTR 21
Data for Write 5 Constants
DPU Close
PTR 22
Data for Write 5 Constants
DPU Reset Targets
PTR 23
Data for Write 5 Constants
DPU RESET ALARMS
PTR 24
Data For Write 5 Constants
DPU RESET LATCHED DATA
PTR 25
Data for Write 5 Constants
PCD TRIPS
PTR 26
Data For Write 5 Constants
PCD CLOSE
PTR 27
Data For Write 5 Constants
PCD RESET TARGETS
PTR 28
Data For Write 5 Constants
PCD RESET ALARMS
PTR 29
Data For Write 5 Constants
PCD RESET LATCHED DATA
PTR 30
Data For Write 1 Constant
PCD WRITE TRIGGER
PTR 31
PTR 33
PTR 34
Data to Parameterize
the Modbus Instructions
at 40355 to 40384 and
also to store write data
parameters for control
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