AH500 Module Manual 8.4.2 Introduction of the Related Instructions After AH10SCM-5A is installed, users need to write a program to control the related functions of AH10SCM-5A. The users can read data from a control register in AH10SCM-5A by means of the instruction FROM, and write data into a control register AH10SCM-5A by means of the instruction TO. Symbol: m 1 ： Rack code Word/Double word m 2 ： Slot code Word/Double word m 3 ： Control register number Word/Double word D 1 ： Device in which the data is stored Word/Double word D 2 ： Device in which the error code is stored Word/Double word n ： Data length Word/Double word Explanation: 1.
Users can use this instruction to read the data from the control register in the special module into the AH500 series PLC. 2. The operand m 1 should be in the range of 1 to 8. 1 represents a main rack, and 2~8 represent extension racks. 3. The operand m 2 should be in the range of 0 to 11. If the rack code is 1, the slot code should be in the range of 0 to 11. If the rack code is in the range of 2 to 8, the slot code should be in the range of 0 to 7. 4. The operand m 3 specifies the control register number. 5. When the instruction FROM is executed, D 2 is set to 0. When an error occurs, D 2 is not set to 0.
Please refer to the additional remark below for more information about the error codes. 6. The operand n used in the 16-bit instruction should be in the range of 1 to 256, and the operand n used in the 32-bit instruction should be in the range of 1 to 128. 7. Only the 32-bit instructions can use the 32-bit counter. 8. Please refer to the regulation of the operands in the instruction TO for more information about the numbering of the special modules. Example: Suppose the first special module at the right side of the CPU module is AH10SCM-5A. When X0.0 is switched from OFF to ON, the instruction FROM is executed.
The mode of the data exchange 8-16 API Instruction code Operand Function 1400 D FROM P m ,m ,m ,D ,D ,n 1 2 3 1 2 Reading the data from the control register in the special module Device X Y M S T C HC D L SM SR E PR K 16# “$” DF m 1 m 2 m 3 D 1 D 2 n Pulse instruction 16-bit instruction (13 steps) 32-bit instruction (13 steps) AH500 AH500 AH500