#Siemens step 7 counter example software#

Because both the up- and down-counters have the same address, C5:1, the accumulated value will be the same in both instructions as well as the preset.

As a car leaves, the exit switch triggers the down counter output instruction and decrements the accumulated count by 1.

As a car enters, the enter switch triggers the up counter output instruction and increments the accumulated count by 1.

The operation of the program can be summarized as follows: A typical PLC program that could be used to implement this. One application for an up/down-counter is to keep count of the cars that enter and leave a parking garage.

Normally, the down counter is used together with the ascending counter to form an up / down counter. Each time the countdown event occurs, the accumulated value decreases. The down-counter instruction will count down or decrease by 1 each time the counted event occurs.

Counting can resume when rung 4 goes false again.

The counter is reset by closing pushbutton PB2, which makes rung 4 true and resets the accumulated count to zero.

At the same time, rung 3 becomes false and de-energizes output O:2/1 to switch the green pilot light off.

As a result, rung 2 becomes true and energizes output O:2/0 to switch the red pilot light on.

After 7 pulses, or counts, when the preset counter value equals the accumulated counter value, output DN is energized.

Each false-to-true transition of rung 1 increases the counterвЂ™s accumulated value by 1.The preset value of the counter is set to 7.Operating pushbutton PB1 provides the off-to-on transition pulses that are counted by the counter.The counter output instruction will increase by 1 each time the counted event occurs. This counter output must be activated whenever the current value is equal to or greater than the preset value (Q is active if CV в‰Ґ PV). Whenever there is a true value entry in the CU input, the counter will turn on and CV will display the count. Up counter is an increment counter.В which means it counts вЂњupвЂќ with each off-to-on transition input to its вЂњCUвЂќ input. 0.For both UP and Down counters there is only one trigger is needed to start the counting, but for up/down counter it is needed two triggers, one for up and other for down counter. The Communication with PLC Logo! is by ETHERNET (TCP/IP) you should change your Sub-network number in your computer, remember Logo! comes with 192.168. NO, However both use same block, the diferences are the connections in the block and the form to use those Up starts to count +1, and Down Count in -1, to see it GO STEP 2ДЇirst you need your Counter Block C00x the Output will activate when the Counter reach the Defined Value then you must take a Open/Closed Contact in the Side and add the Name of Counter (C00x), REMEMBER the form use a Up Counters VS Down Counter is Very diferent STEP 2

Do Counters UP and DOWN use same programmation?.

#Siemens step 7 counter example software#

Where Can Download Logo Soft Comfort! The Software of PLC Logo? and Buy Original CD?ДЇor the Version DEMO go to Siemens Webpage here or you try in the above external links of Step 2 Here It Costs around 70 USD (without upgrades) and you can get it in a external company Buy in Automation24 this software may be installed in many computers.

Reset: A Reset is a instruction in a Counter that when is actived the Currently Value is back to Start Value in a Up Counter may back to '0' and in a Down Counter to 'Start Value defined'.

Software Flag (Mx): Flags 'M' are a types of Outputs-Contacts that allow create a lot of logical in our Software, Activate a Flag(M) Coil, means we can use it for a lot of instructions using his Open or Closed Contacts (M using in -||- or -|/|) For programmers, Flags mean create infinite style of programs and is one of the most importants things to consider.

Counter Down: There are the Counters that the value is -1, in each push or pulse in Counter Block it subtract -1 at the count, programmation is very diferent to Counter Up.

Counter UP: There are the Counters that the value is +1, in each push or pulse in Counter Block it add +1 at the count.