s7 300 memory reset

benji

Member
B
Join Date
Oct 2008
Location
syria , Aleppo
Posts
72
i did perform a clear/reset memory via STEP 7 in online mode but i can still see blocks inside the plc,it dont seem to be deleted
ob1 is the same and many system blocks too
i tried the mres also and it doesnt work,,any clue?
 
Use the online view in Simatic manager then select the blocks you wish to delete then press delete. You cannot delete system blocks.
 
the ob1 just doesnt go empty ,,

isnt this the way to go?
plc >> diagnostics/settings >> Clear/reset


what memory does this clear? is it the card? how can i download to the card?

thanks for help
 
Hi All



Is there a way to reset an S7 back to default settings.

Lets say you set up a MPI port as a DP and now yiu want to set it back to DP but do not have a DP dongle.Is this possible or is the only way to get online via DP and then change the settings to MPI.

Just asking as it is now a million miles away from this question.



Donnchadh K.
 
As far as I know it depends on the PLC. If you do a Memory Reset one inmediately after another, the interface should be set to MPI for most S7 I've used.
 
Hi Donnchadh

It depends on what you have on the card.

If you reset without the card, the IF will be set to the default MPI; but if you have a hardware configuration on your card, as soon as you restrat the PLC, you'll get the configuration that is stored on the card.

So if you want to know, test it first without the card.

I hope this helps.
 
What if you leave the MMC card in the CPU during the reset, doesnt it get reset too ?

I believe I saw something once that if there is a corrupted image on the MMC it couldnt be reset in a CPU, only in a prommer. And this I guess is an indirect way of saying that if there is a valid configuration on it, then it will be reset if you perform a reset by means of the MRES switch.
 
Hi Jesper,

As far as I know the MMC card in the CPU is not reset with a CPU Memory Reset. You are right. If the mmc card is corrupted, you must reset it with a programming unit.
 
whats the difference between a warm restart and cold restart?
i did read some about this but its not clear to me yet
and how do i perform a cold restart?
 
Warm restart and cold restart exist only for the S7-400. The cold restart (or complete restart) resets the process image and all non-remanent signals of the CPU. With a warm restart you "continue" processing the program where it was when the CPU was stopped. So no signals are reset.

You perform a complete or cold restart via an additional switch on the CPU or by hardware configuration.

I hope it helps.
 

Similar Topics

S
Siemens S7 300 313C Memory Card Password Reset
hello Friend There is one old system with S7 300 CPU which is password protected and I dont know the password. Now I want to remove the password...
Replies
6
Views
5,915
sarfraz_jsr04
S
T
Kinetix 300 memory module.
Hello, I have (probably silly) question about Kinetix 300. Do you have to manually send/save Kinetix parameters in the memory module and if so...
Replies
1
Views
766
jholm90
J
M
S7-300 memory read
Another problem for me! :) Is it possible to see what is written into PLCs memory in RUN mode and if it is, can someone tell me how to see it...
Replies
1
Views
1,518
ivo.maenen
ivo.maenen
N
S7 300 Memory Card loading with no CPU
Can anyone advise please ? I did a project with an S7 315 2PN/DP a few months back and the machine has now been shipped out to China. Some mods...
Replies
3
Views
5,090
Mrslipmat
M
J
How to upload Memory Card FEPROM to S7-300 315-2DP
Hi Group, Please correct me if Im wrong. Memory Card FEPROM serves as LOAD MEMORY that contains configuration file and user progam. Since...
Replies
0
Views
5,269
joeyd11ph
J
Back
Top Bottom