7 PLC programming
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7 PLC programming
7.1 PLC function
The H0U series PLC functions are basically the same as the H1U series PLC functions, and the
instructions are fully compatible with the H1U/H2U series PLC instructions. The difference is:
1) The COM0 port of H0U series PLC is a RS485 connection port instead of a RS422 port.
The program is downloaded and monitored through the USB to RS232/RS485 converter.
2) The function of the COM2 port of H0U is the same as that of the COM1 port. Please
refer to the COM2 port configuration of H2U series PLC for the specific usage method.
3) H0U has no DIP switch, it runs automatically after power on. Run and stop control can be
performed through AutoShop and run and stop operations can be performed through
M8035, M8036, and M8037.
7.2 Device
The H0U soft element is basically the same as that of the H1U/H2U series PLC, and the D
element save function is same as the H1U series PLC.
Application area of D component of H0U series PLC:
Please refer to "Inovance Small PLC Instruction and Programming Manual" V2.1 for the meaning
of specific soft elements and special soft element functions. The differences of H0U soft
components are:
1) The maximum size of M and D of H0U is 8399. There are restrictions in the H0U part of
AutoShop, and there are also restrictions in HTodEditor software.
2) The password operation of TOD text adopts the mode of special register. For the definition
of password special register, refer to the section on password function.
3) The 6AT H0U expansion cards use special registers to set and display the analog value
and temperature value.
Refer to "Extended Function Part" for the specific meaning of expansion card registers.
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