Optional features of memory card (A/FX compatible).
2MB extended memory.
Applicable models: A985 (-V) /975/970/A960GOT (-B) /A956WGOT. Multi axis positioning controller AS91 PDF.
Coaxial data communication line function.
Program capacity: Max 60K step.
Input / output points: 1920 points.
PLC commonly used in memory are EPROM, EEPROM and with lithium battery powered RAM.
General micro and small PLC storage capacity is fixed, between 1~2KB AS91
How much memory is occupied by a user application is related to many factors,
Such as I/O points, control requirements, computing processing, program structure, etc AS91 PDF. .
So it can only be roughly estimated before the program is designed. Input and output points: 2048 points.
Input / output data points: 2048 points.
Program capacity: 30K.
Basic command processing speed (LD command) s:0.15.
Coaxial data communication line function.
Integral type: the PLC components are installed together or a few pieces of printed circuit board,
And together with the power supply installed in the casing to form a single overall callled the host or the basic unit, small, ultra small PLC using this structure AS91 PDF AS91 Manual.
Modular: PLC is the basic components of a separate module.
Medium and large PLC used this way MITSUBISHI User's Manual. Easy maintenance.
Each scanning process. Focus on the input signal sampling. Focus on the output signal to refresh.
Input refresh process. When the input port is closed,
Program in the implementation phase, the input end of a new state, the new state can not be read.
Only when the program is scanned, the new state is read MITSUBISHI User's Manual.
A scan cycle is divided into the input sample, the program execution, the output refresh.
The contents of the component image register are changed with the change of the execution of the program.
The length of the scan cycle is determined by the three MITSUBISHI User's Manual.
CPU the speed of executing instructions.
Time of instruction.
Instruction count.
Due to the adoption of centralized sampling.
Centralized output mode.
There exist input / output hysteresis phenomena, i.e., the input / output response delay.
User program storage capacity: it iis a measure of how much the user application can store the number of indicators AS91 User's Manual.
Usually in words or K words as units. 16 bit binary number is a word,
Every 1024 words are 1K words. PLC to store instructions and data in words.
General llogical operation instructions each account for 1 words AS91 Manual. Timer / counter,
Shift instruction accounted for 2 words. Data operation instructions for 2~4.