1. How the CPU works
The front panel of the CPU uses two LEDs to display the current working mode. The green indicator light is on, indicating that it is in the running state. The red indicator light is on, indicating that it is in the stop state. When the SF indicator is on, it indicates that the system is faulty and the plc stops working.
(1) STOP. When the CPU stops working, the program is not executed. At this time, the program can be loaded into the PLC or set by the programming device. In the process of program editing, downloading, etc., the CPU must be placed in the STOP mode.
(2) RUN (run). When the CPU is in the RUN mode, the PLC runs the user program according to its own working mode.
2. Ways to change the way you work
(1) Change the working mode with the work mode switch.
The working mode switch has 3 gears: STOP, TERM (Terminal), RUN.
By cutting the mode switch to the STOP position, the execution of the program can be stopped.
By cutting the mode switch to the RUN position, the execution of the program can be started.
Switching the mode to the TERM (Transient) or RUN bit allows the STEP7-Micro/WIN32 software to set the CPU operating state.
If the working mode switch is set to STOP or TERM, the CPU automatically enters the STOP working state when the power is turned on.
When set to RUN, the CPU automatically enters the RUN working state when the power is turned on.
(2) Change the working mode with programming software.
Switch the mode switch to TERM (Transient) and set the working mode using STEP 7-Micro/WIN32 programming software.
(3) Change the working mode with instructions in the program.
Insert a STOP command in the program, the CPU can enter the STOP mode by RUN mode.
model
CPU221
CPU222
CPU224
CPU226
CPU226MX
User data storage type
EEPROM
EEPROM
EEPROM
EEPROM
EEPROM
Program space (permanently saved)
2048 words
2048 words
4096
4096 words
8192 words
User data storage
1024 words
1024 words
2560 words
2560 words
5120 words
Data backup (super capacitor) typical value / H
50
50
190
190
190
Host I/O points
6/4
8/6
14/10
24/16
24/16
Scalable module
no
2
7
7
7
24V sensor power supply maximum current / current limit (mA)
180/600
180/600
280/600
400/about 1500
400/about 1500
Maximum analog input/output
no
16/16
28/7 or 14
32/32
32/32
240V AC power supply CPU input current / maximum load current (mA)
25/180
25/180
35/220
40/160
40/160
24V DC power supply CPU input current / maximum load (mA)
70/600
70/600
120/900
150/1050
150/1050
Output current of the DC5V power supply for the expansion module
-
Maximum 340mA
660mA maximum
Maximum 1000mA
Maximum 1000mA
Built-in high speed counter
4 (30KHz)
4 (30KHz)
6 (30KHz)
6 (30KHz)
6 (30KHz)
High speed pulse output
2 (20KHz)
2 (20KHz)
2 (20KHz)
2 (20KHz)
2 (20KHz)
Analog adjustment potentiometer
1
1
2
2
2
Real Time Clock
Yes (clock card)
Yes (clock card)
Have (built in)
Have (built in)
Have (built in)
RS-485 communication port
1
1
1
1
1
Number of points entered in each group
4,2
4,4
8,6
13,11
13,11
Number of output points of each group
4 (DC power supply)
1,3 (AC power supply)
6 (DC power supply)
3, 3 (AC power supply)
5,5 (DC power supply)
4, 3, 3 (AC power supply)
8,8 (DC power supply)
4, 5, 7 (AC power)
8,8 (DC power supply)
4, 5, 7 (AC power)
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