ABB TPU2000 Technical Manual page 366

TPU2000/2000R Modbus/Modbus Plus/ Modbus TCP/IP Automation Guide
The MSTR is intended to access data from the ABB Protective relay. Figure 7 illustrates the Registers 400100
through 400108 which must be parameterized in order to obtain relay data. Figure 7 shows the MSTR
configuration screen containing the parameters required for the Ladder Logic to operate correctly.
Figure 7. MSTR Configuration Parameters
This example illustrates the configuration of Reading (PLC Register 400100 = 2) sixteen registers (PLC Register
400102 = 16) representing KW phase A,B,C, Total KW, KVARS phase A,B,C, and Total KVARS (Function
Dependent Information from ABB DPU2000R Modbus Address 40283), at Node number 10 (DPU2000R = Node
10 [Address = 00A HEX]). Note the RELAY address is specified as the configured address via the relay front
panel (Register 400104 = 10) and the Modbus Plus Data Slave path (in this case Data Slave Path 1 as
designated in Register 400105 = 1).
Each time the MSTR instruction is executed, the data as designated in the parameterization block of 400100 to
400108 shall be transferred from the DPU 2000R's address to the PLC's data buffer which in this case resides in
addresses 400110 through 400139 ( as designated by the length of 30 at the bottom of the MSTR instruction). As
illustrated in Figure 5, the data is transferred from the ABB DPU2000R's register map to the PLC's registers as
illustrated.
Ladder logic may be written to change the parameters within the MSTR block so additional values may be
obtained from the ABB DPU2000R. A sample ladder logic construct is included in Figure 8 which energizes the
MSTR instruction when its operation has terminated.
Figure 8. MSTR Cyclic Timer Ladder Logic
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