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What is timer and counter in PLC?

What is timer and counter in PLC?

Timer and Counter


The timer in the PLC counts the time, and the counter counts the events.

The timer does count only the time, and the counter has a certain period of time because the PLC has a scan period, and the timing can be implemented with the timer or the corresponding logic.

Similarities and differences between timers and counters of Mitsubishi PLC

1, function is different, one timing, one counting
2, code is different, one is T and one is C
3,The trigger mode is different, the timer should be always on, and the counter only needs one pulse.
4, Once the timer reaches the set value, it will not be counted again, and the counter can reach the set value and can count up in the past.
5, When the counter and timer are written, the format is almost the same as the code before the set value is after
6, Both can be triggered by time delay

plc counter ladder example

plc timer examples

Time control programming example implemented by Mitsubishi PLC with timer and counter

Time control programming example


The timer of the Mitsubishi plc FX series is a power-on delay timer. Its working principle is that after the timer coil is energized, the delay starts, the time is up, the contact action; when the timer coil is powered off, the timer The contact is instantly reset.

However, in practical applications, we often encounter control requirements such as power-off delay, time-limited control, and long delay, which can be achieved through programming.

1, power-on delay control

The delay on control program is shown in Figure 3-27. The control function it realizes is that after X1 is turned on 5, Y0 has output.

The working principle is analyzed as follows:

When X1 is in the 0N state, the coil of the auxiliary relay M0 is turned on, and its normally open contact is closed and self-locking, so that the coil of the timer T0 can be kept in the power state.

After the coil of T0 is turned on for 5 s, the current value of T0 is equal to the set value, the normally open contact of T0 is closed, and the coil of output relay Y0 is turned on.

When X2 is in the ON state, the coil of the auxiliary relay M0 is turned off, the timer T0 is reset, and the normally open contact of T0 is turned off, so that the coil of the output relay Y0 is turned off.



2, power failure delay control

The delay off control program is shown in Figure 3-28. The control function it implements is that the output stops working after the input signal is disconnected for 10s.

The working principle is analyzed as follows:

When X0 is in the ON state, the coil of the auxiliary relay M0 is turned on, its normally open contact is closed, and the coil of the output relay Y3 is turned on. However, the coil of timer T0 will not be energized (because its front () is off).




When X0 changes from ON to OFF, () is in the on state, and timer T0 starts counting. After l0s, the normally closed contact of T0 is opened, the coil of M0 is de-energized, and the output relay Y0 is disconnected.

3, limited time control

In actual engineering, it is often encountered to limit the working time of the load to a specified time. This can be achieved by the program shown in the figure, which implements the control function of controlling the maximum working time of the load as l0s.



The program can achieve the minimum working time to control the load. The control function implemented by this program is that the minimum working time of the output signal Y2 is 10s.




4, long delay control program

In the PLC, the timer's timing is limited, the maximum is 3276.7s, less than lh. To achieve longer timing, you can use two or more timer cascades, or use a timer with a counter, or use a counter with a clock pulse.






(1) Timer cascade use

When the timer is used in cascade, its total timing is the sum of the time set by each timer.

Figure Use two timers to complete the 1.5h timing. When the timing is up, Y0 is powered.

(2) Combination of timer and counter











The timing of 1h is completed with a timer and a counter.

When X0 is turned on, M0 is powered and self-locked, and timer T0 generates a pulse sequence with a period of 100s by itself resetting as a count pulse of counter C0. When the counter has 36 pulses, its normally open contact closes, causing output Y0 to turn on. From X0 to Y0, the delay time is 100s x 36 = 3600s, which is 1h.






(3) Combination of two counters

Figure 3-33 shows the timing of 1h with two counters.

M8013 (1s clock pulse) is used as the count pulse of counter C0. When X0 is turned on, counter C0 starts counting.

After 60 pulses (60 s) have been counted, its normally open contact C0 sends a count pulse to counter C1 and resets counter c0.

The counter C1 counts the c0 pulse. When 60 pulses are counted, the normally open contact of C1 is closed, and the output Y0 is turned on. From X0 to Y0, the timing is 60s x 60 = 3600s, which is 1h.











5, boot cumulative time control program

The PLC running cumulative time control circuit can be used in combination with M8000, M8013 and counter to compile the display circuit of seconds, minutes, hours, days and years. Here, you need to use the power-off type counter (C100~C199), so that the accumulated time of each power-on can be timed, as shown in the figure.



touchwin op320a user manual

touchwin op320a user manual

touchwin op320a user manual


touchwin op320a

xinje touchwin software

xinje touchwin software

xinje touchwin software



OP320 manual
Software OP20v6.5y
Software OP20v8.0q
Example
Connect s7200 plc
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How to write a general mode parallel link communication program?

Write a general mode parallel link communication program


Two FX2N series PLCs exchange data through a 1:1 parallel link communication network, designing one

General mode communication program. The communication operation requirements are as follows.


(1) The ON/OFF status of the master station XOOO to X007 is output to the slave station through M800 to M807.

YOOO—Y007.


(2) When the calculation result of the master station (DO+D2) ≤ 100, the YOIO of the slave station changes to ON.


(3) The ON/OFF status of the MO to M7 in the slave station is output to the master station through MOOO to M007.

YOOO~Y007.


(4) The value of the slave D10 is used to set the timer (TO) value of the master station.


Solution: Set the program of the master station and the slave station according to the requirements of the topic, as shown in Figure 6-25. Figure 6-25 (a)

Set as the master station, complete the XO ~ X7 state input, (DO + D2) operation, status output, and

Timer operation settings. Figure 6-25 (b) is the slave setting, respectively, the output setting and comparison operation are completed.

And the timer setting and other operations.



How to program the master station setting program for N:N network parameters?

N:N network parameters


Setting requirements: Set the PIC as the master station, set the number of slave stations to 2, and use the mode 1 brush.

New, the number of communication retries is set to 3, and the communication timeout is set to 40ms.


Solution: Set according to the setting requirements, and get the program ladder diagram. M8038

After the action, five M()V instructions are executed, D8176 is O, which is set as the master station; D8177 is 2,

The number of slaves is set to 2; the value of D8178 is 1, and it is refreshed by mode l; the value of D8179 is 3, and the setting is

The number of retries is 3; the value of D8180 is 4, and the communication timeout is set to 40ms.





The requirements for the initialization setting procedure of the parallel network are as follows.

(l) Refresh range: 32-bit component and 4-word component (mode 1).

(2) Number of retries: 3 times.

(3) Communication timeout: 50ms.

What is the execution order of the PLC program?

PLC program execution order

(1) The ladder diagram should be programmed with the left bus as the starting point and the right bus as the end point, from left to right, written line by line.


The beginning of each line is the starting condition, consisting of normally open, normally closed contacts or a combination thereof. The rightmost coil is the output. After one line is written, one line is written from top to bottom. Do not write contacts on the right side of the coil



(2) The contacts should be drawn on the horizontal line and cannot be drawn on the vertical branch line.

As shown in the figure, the contact X005 is drawn on the vertical line, which makes it difficult to correctly identify the relationship with other contacts, and the circuit should be rearranged.



(3) When several series circuits are connected in parallel, the branch with the most contacts should be placed at the top of the ladder diagram.



For the case where several parallel circuits are connected in series, the parallel circuit with the most contacts should be placed at the far left of the ladder diagram. This arrangement can make the program simple and clear, and the instruction statement is also less.

How to set up the Siemens s7-400 plc configuration

Configuring the S7-400 master station


(1) Right click in the right area and select "SIMATIC 400 STATION" in the pop-up shortcut menu Order, insert 400 sites, the corresponding S7-400 station will be displayed in the right window of the screen.



(2) Double-click the "Hardware" icon to configure the rack, PS and CPU modules and insert the CPU414-3DP

When selecting a module, select the same PROFIBUS network as the slave and set the station address parameters, in this example

The PROFIBUS address of the CPU 414-3DP is 2. After the configuration is completed, click the "OK" button to confirm the appearance.

PROFIBUS network



(3) Select "PROFIBUS DP" on the right side of the HW configuration configuration interface of S7-400.

Select "CPU315x" in "Configured Stations" and drag it to the PROFIBUS bus on the left.



(4) "DP slave" that appears

In the properties dialog, it appears

Two slave stations configured



(5) Select one of the CPUs and click the "Connect" button to connect it to the PROFIBUS

On the network, then connect a slave in the same way. To disconnect the site from the network, select "Dis

Connect". After the connection is completed, set the corresponding master I/O interface area for the two S7-300 slaves.

For example, to set the I/O interface area of the CPU315-2DP with address 3, double-click on station 3, and pop up

Click the "Edit" button in the "Configuration" column of the "DP slave properties" dialog box, group

The main station is the communication interface area of CPU414-3DP




(6) Configure the communication address area of the master station separately, and the corresponding rules are the main station output to the slave station input, the master station loses

Into the slave output. Then configure the communication interface area of the No. 4 slave station corresponding to the master station in the same way.

Corresponding communication address after configuration is completed



how to sets real-time clock S7-200 PLC

S7-200 PLC sets real-time clock command: TODW (Set Real-time Clock)



When the enable input EN is active, the instruction loads the contents of the 8-byte buffer (start address is T) containing the time and date into the clock. The set value range is the same as the TODR command. Corresponding ladder diagram






The addressing range of T: VB, IB, QB, MB, SMB, SB, LB, *VD, *AC, *LD.

Instruction format: TODW T



Enable error condition for stream output ENO disconnect: 0006 (indirect addressing); 0007 (TOD data error); 000C (no clock present); SM4.3 (run time).



The S7-200 PLC does not perform checks and verifies that the date is accurate. Invalid dates (such as February 30) can be accepted, so you must ensure the accuracy of the input data.



Do not use the TODR/TODW instruction in both the main program and the interrupt program. Otherwise a fatal error will result.

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