Clock pulse in Step 7-s300

Dear All,

I am really new for STEP 7. I am interested in clock pulse in step 7. Is there any auxiliary memory that give 1 second clock pulse or other pulse in STEP 7? If yes. what are they? How can I use it in program? what are the symbol? 

Thank you in advance for all help. 

hi,

in the HW-Config at the properties of your PLC you can set a MarkerByte to a "pulse marker byte"(hope this is the rigth translation).

This "pulse marker byte" contains 8 different alternating Marker from 10Hz to 0,5Hz.

hope this helps,

regards, 

Hi,

See attached the parameters you need to configure in Hw Confg.

With byte 5 you will have MB5 reserved for click pulses.

Each bit represents a pulse frequency according to array located at the bottom of the picture attached.

Regards.

Hi

The Clock Memory gives square wave. You configure it in HW Config.

To make pulses You need use positive / negative edge instructions:

Let's say Your clock bit is MB0 (M0.0 to M0.7)

Let's say Your clock pulses will be in MB1 (in same order as bits in MB0)

and MB2 (M2.0 to M2.7) would contain bits for exclusive use of edge detectors:

A M0.0

FP M2.0

= M1.0

A M0.1

FP M2.1

= M1.1

and so on to M0.7, M2.7, M1.7

This way You get wave and one shot pulses for every clock memory bit.

Note: When You need 50ms pulse use both edges of  100ms wave.

 how can i use that marker in blocks of simatic manger and how can determine that marker is a Clock memory

Panov69

Hi,

See attached the parameters you need to configure in Hw Confg.

With byte 5 you will have MB5 reserved for click pulses.

Each bit represents a pulse frequency according to array located at the bottom of the picture attached.

Regards.

Hello eng.ehab.

You can select your clock memory byte in CPU properties on Hardware configuration. 

The byte has 8 different frequency flashing bits. You can address them i.e. you ser M0 as memory byte, so you get

M0.0----10 Hz

M0.1----5 Hz

M0.2----2.5 Hz

M0.3----2 Hz

M0.4----1.25 Hz

M0.5----1 Hz

M0.6----.625 Hz

M0.7----.5 Hz

Does this answer you question?

Regards

i know that but i wanna increase the time of puls  to 10 second i mean each 10 sec i get one puls how can i do that ?

Hello eng.ehab.

You can select your clock memory byte in CPU properties on Hardware configuration. 

The byte has 8 different frequency flashing bits. You can address them i.e. you ser M0 as memory byte, so you get

M0.0----10 Hz

M0.1----5 Hz

M0.2----2.5 Hz

M0.3----2 Hz

M0.4----1.25 Hz

M0.5----1 Hz

M0.6----.625 Hz

M0.7----.5 Hz

Does this answer you question?

Regards

Oh, well thats not possible with the clock memory. But there are several ways to achieve what you want.

Examples would be use an cyclic interrupt OB to execute each 10 seconds and to write your pulse.

Count 10 times the 1 second pulse bit, then compare when value reach 10, generate the pulse you need.

...sent from App

Thanks alot. So useful 👍