The division of the storage area of Omron PLC

Create Date: 2024-8-30 12:03:23|Source: Omron/Omron

1. I/O relay area: there are 30 channels in total, and the address is 000-029. An idle relay or channel can be used as an intermediate relay. The rack slot number is from 007CH to 001CH from the left of the CPU unit.

The I/O address number is represented by 5 digits: 1, single digit, 10 digits represent relay tag 2, 100 digits represent slots on the rack 3, 1000 digits, and 10,000 digits represent rack numbers

2. IR internal auxiliary relay area: used for storage of data processing results and internal intermediate relay. The channel number is: 030-250.

3. SR special relay area: used to monitor the working status of the PLC system, generate clock pulses and error signals, etc. The passage numbers are 251-255.

1. Battery alarm sign 25308

2. Load shutdown control sign 25215

3. Arithmetic operation mark: (1) CY carry mark 25504 (2) EQ is equal to mark 25506 (3) GR is greater than mark 25505 (4) LE is less than mark 25507 4. Clock pulse mark: (1) 1min pulse period flag 25400 (2) 0.02s pulse period flag 25401 (3) 0.1s pulse period flag 25500 (4) 0.2s pulse period flag 25501 (5) 1.0s pulse period flag 25502

4. HR holding relay area: used for the storage and operation of various data. The address range is HR00 - HR99. 5. TR temporary storage relay area: used to store the data on the program branch point, for the program with many output branch points

It's useful, but you can't use IL and ILC (branch directives) in that place. The addressing range is TR00-TR07. 6. AR auxiliary relay area: the function and usage method are the same as those of HR area. Address number AR00-AR27. AR07 and AR22 are user-writable areas. AR00 - AR06, AR23 - AR27 are not writable to the user.

7. LR connection relay area: part of it is used for data communication of the system. Address number LR00-LR63

8. TC Timer/Counter: Provide users with 512 timers/counters. Address number 000-512, this can only be used in the channel unit. 9. DM data storage area: used for internal data storage and processing, can only be used in 16-bit channels. Channel number range 0000-1999.

9. Each input/output contact of PLC is referred to as a micro PLC with a number of I/O points less than 64 points, a small PLC with I/O points at 64-256 points, a medium-sized PLC with I/O points at 256-1024 points, and a large PLC with I/O points above 1024 points

Depending on the complexity of the industrial control system, the functions of the required PLC are also different

Low-grade machine: only switch operation, logic operation, timing and counting

Mid-range machine: with switching and analog control, digital operation, interrupt control and communication functions

High-end machine: with switching and analog control, matrix operation, data management, communication networking and other functions
The division of the storage area of Omron PLC

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