12. Communication Design Examples Control Program: M1002 Set up communication format: 9600,8,N,2 Retain communication setting Set receiving time-out: 100ms Select communication mode: MODBUS RTU Upper limit of temp. Range:50 ℃ Lower limit of temp. Range:0 ℃ Upper-limit of the alarm:
5 ℃ Lower-limit of the alarm:3 ℃ M0 Execute MODRD instruction M1 Execute the 1st MODWR instruction M2 Execute the 2nd MODWR instruction M3 Execute the 1st MODRW instruction M4 Execute the 2nd MODRW instruction M0 Sending request M1 M2 M3 M4 DVP-PLC Application Examples 12-26 Device Function M0 Executing MODRD instruction to read target and present temperature M1 Executing the 1st MODWR instruction to set target temperature of TC M2 Executing the 2nd MODWR instruction to set alarm output type M3 Executing the 1st MODRW instruction to set the upper/lower limit of temperature range M4 Executing the 2nd MODRW instruction to set the upper/lower limit of alarm 1 MOV H89 D1120 SET M1120 MOV K100 D1129 SET M1143 MOV K500 D0 MOV K0 D1 MOV K50 D2 MOV K30 D3 LD= C0 K0 LD= C0 K1 LD= C0 K2 LD= C0 K3 LD= C0 K4 LD= C0 K5 RST C0 SET M1122