16. Network Connection Design Examples 16.4 RTU-485 Connection DVP28SV RUN STOP 28SV RS485 Control Purpose: z The station No. of RTU-485 is 1. Write H ’ 0001 into CR#6 of the 1 st special module. Max connectible special modules: 8; Max. DI/DO: 128 inputs and 128 outputs. Devices: z Explanation on devices: z Explanation on communication address: DVP-PLC Application Examples 16-12 RTU-485 COM2 TS80-PVD DVP-16SP DVP-04AD CT40-PVD TP40-PVD DVP-02DA DI/DO AI/AO PLC Device Function M0 When M0 = ON, the master device will send out a request message to RTU-485 D1120 Storing COM2(RS-485) communication protocal M1120 Retaining COM2(RS-485) protocol. Change of D1120 is invalid when M1120 = ON.
M1122 Sending request M1127 Data receiving completed M1129 Communication timeout M1143 Selecting ASCII/RTU mode of COM2(RS-485). OFF: ASCII; ON: RTU Communication Devices Attribute Data type Length address H’1600 ~ H’1630 1st special module: CR0 ~ CR48 8 8 Please refer to the 8 CR attribute of each special 8 module. 8 8 8 word 49 H’1640 ~ H’1670 2nd special module: CR0 ~ CR4 word 49 H’1680 ~ H’16B0 3rd special module: CR0 ~ CR4 word 49 H’16C0 ~ H’16F0 4th special module: CR0 ~ CR4 word 49 H’1700 ~ H’1730 5th special module: CR0 ~ CR4 word 49 H’1740 ~ H’1770 6th special module: CR0 ~ CR4 word 49 H’1780 ~ H’17B0 7th special module: CR0 ~ CR4 word 49 H’17C0 ~ H’17F0 8th special module:
CR0 ~ CR4 word 49