S7 300 Programming

benji · Oct 2, 2008

Hello

first I wanna say that Im new here so hello everybody

Im going to use the S7-300 Modular plc to monitor 8 tempreture sensors so I need 8 Analog inputs
I m not sure what cpu to use and what analog input cards to use as I have never worked with s7 plcs

i do seek advice and thank you in advance

ps

whats the software to program it

and I also want to learn about analog inputs programing

where is the way to go ,,any manuals

userxyz · Oct 2, 2008

step 7

I used these analogue cards to measure temperature in our company:

SM331,8AISIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED,8 AI, 13 BIT RESOLUTION,U/I/RESISTANCE/PT100,NI100, NI1000, LG-NI1000,

The software = look for simatic step 7

Check out the diffirence between 2wire and 4wire, I used 2wire.

The analogue input is in Siemens PLC's: INTEGER 0 to 27648

If u want to represent it in 30 to 180 degrees for example, then you have to scale, mostly I do it like this:

L PIW256 // ANALOGUE INPUT ADRESSING
ITD
DTR
L 27648.0
/R
L 150.0 // new range
*R
L 30.0 // offset
+R
T RESULT // Result in Real format

Or use FC105 out of the siemens library.

Best thing todo would be buying a book of Hans Berger, Step 7 LAD/FBD would be a good beginning.

benji said:
Hello

first I wanna say that Im new here so hello everybody

Im going to use the S7-300 Modular plc to monitor 8 tempreture sensors so I need 8 Analog inputs
I m not sure what cpu to use and what analog input cards to use as I have never worked with s7 plcs

i do seek advice and thank you in advance

ps
whats the software to program it

and I also want to learn about analog inputs programing

where is the way to go ,,any manuals

userxyz · Oct 2, 2008

...

CPU: don't know what other things you wanna do in the PLC

But, a 314 is not bad...

Also check VIPA

benji said:
Hello

first I wanna say that Im new here so hello everybody

Im going to use the S7-300 Modular plc to monitor 8 tempreture sensors so I need 8 Analog inputs
I m not sure what cpu to use and what analog input cards to use as I have never worked with s7 plcs

i do seek advice and thank you in advance

ps
whats the software to program it

and I also want to learn about analog inputs programing

where is the way to go ,,any manuals

benji · Oct 2, 2008

thanks u combo

I do program in Ladder logic, can you show me how to read the analog input in ladder logic,, i would appreciate it

and how do you kow whats the cards analog input address?

and about the software i see that there is S7 micro/win
and S7 professional
S7 Lite and S7 mini

which one is the one i need for S7 300 modular?

the thing im goin to do is watch the 8 temp sensors and keep the
temp in the 8 rooms stable at a designated value
so its a matter of turning the heater on/off

plus i want to connect the plc to the computer
i know about the COM port
are there special softwares for that?
i can build the software on the computer side
but again i dont know how the s7 sends/recieves data bytes

Madman · Oct 2, 2008

1.

2. open hardware

3. S7 professional
4. You need PC Adapter for communication between a PC (COM interface) and a SIMATIC S7 (MPI/DP interface) - (order number 6ES7 972-0CA23-0XA0);or the SIMATIC PC Adapter USB connects a PC via a USB interface with the MPI/DP interface of an S7 systems - (order number 6ES7 972-0CB20-0XA0). You don't need any special softwares, except for the drives for second adapter.

benji · Oct 2, 2008

thank u for the pictures but can you explain a little about the block above, the fc105?
i suppose the PIW256 is the address of the first analog input?

whats the M0.1 at bipolar?

thank u

bkottaras · Oct 2, 2008

Bipolar= -10V to +10V range
Unipolar= 0V to +10V range
(Thats the format not just for Voltage but mAmps and such)

benji · Oct 2, 2008

yea i know but what does it mean in the drawing that there is the M0.1 at the Bipolar terminal?

bkottaras · Oct 2, 2008

benji said:
yea i know but what does it mean in the drawing that there is the M0.1 at the Bipolar terminal?

The state of the bit will decide if it is Bipolar or Unipolar
M0.1=0, then Unipolar
M0.1=1, then Bipolar

benji · Oct 2, 2008

is it a memory bit? how do i set it to 0 or 1 ?

bkottaras · Oct 2, 2008

on the first scan, SET M0.1
never reset it after that.

benji · Oct 2, 2008

can you provide me a ladder logci program of how to read analog signal from 4 to 20 mamps and on output when signal is at 10 mamps

i would appreciate it

bkottaras · Oct 2, 2008

If you look at post #5 by madman it's already there.
Plug in your values for High and Low and use a comparison so when equal or above 10mA then output is on.
No step7 on this PC right now.

userxyz · Oct 3, 2008

...

OB100 = first scan OB.

Write:

SET
S M0.1

It will be true then...

But, I would do it in OB1 network 1 =>

Write:

AN M0.1
S M0.1

Each cycle it will be checked, if it's not 1, then it will be SETTED to 1

benji said:
is it a memory bit? how do i set it to 0 or 1 ?

benji · Oct 3, 2008

how do i set M0.1 in ladder logic , there in the first pic above?

S7 300 Programming

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