siemens plc s7 300 - PLCS.net

valski gonzaga · May 28th, 2009, 01:54 AM

anybody pls provide a how to program analog inputs/outputs for siemens s7 300 PLC, using step7 lite software, thanks

alekbeck · May 28th, 2009, 02:00 AM

There are a lot of different things to do with a analoge input. What are u trying to achieve in youre program?

valski gonzaga · May 28th, 2009, 02:06 AM

just how to configure it in the program, since I only have program a simple DI/DO only. I do not know how to do it, please help, thanks

valski gonzaga · May 28th, 2009, 02:19 AM

just need to know the addressing of analog inputs and outputs

edda · May 28th, 2009, 04:19 AM

Search this forum after FC105 (Scale) and FC106 (Unscale), I´m sure you will find a lot of information about it. Not sure if the same blocks is avalible in Step7 Lite...Have never used that software but you can do it like this in the normal Step7.

FC105 lets you convert your analog input (i.e. PIW128) to a real value via the high and low limit.

The block "SCALE" is FC105 (You can find it under Standard Library -> TI-S7 Converting Blocks).

Here is an example:

CALL "SCALE"
IN :=PIW128
HI_LIM :=1.000000e+002
LO_LIM :=0.000000e+000
BIPOLAR:=FALSE
RET_VAL:=#RET_VAL
OUT :=MD10

IN = your analog input (lets say that its set for 4-20mA).
HI_LIM = Your highlimit, here set to 100.
LO_LIM = Lowlimit = 0.
BIPOLAR = If the signal should be bipolar, normally set to false.
RET_VAL = Here you can error information, its here set to be written to a temp word.
OUT = Here you receive your converted value.

So if you got 20mA in the example above you get 100.0 in MD10... And if you got 4mA you will receive 0.0 in MD10.

FC106 works the same way just backways =)

When using FC105 analog inputs (PIW) and FC106 outputs (PQW) shuld be set to INT in the symboltable.

Regards

/e

hsroomi · May 28th, 2009, 09:43 AM

can anybody explain da same thing on ladder?

edda · May 28th, 2009, 09:53 AM

Pretty much same thing...

valski gonzaga · May 28th, 2009, 06:25 PM

thank you very much edda, I will try this one and keep you posted after testing.regards

valski gonzaga · June 2nd, 2009, 08:17 PM

does anybody seems to now how to program speed indicator using only a proximity sensor and digital input for Siemens S7300 PLC?

mrmss · June 3rd, 2009, 07:06 AM

Depending on wether the CPU has a built in counter - you can use SFB48 "FREQUENC" Frequency Counter its quite straightforward and the help is useful.

PeterW · June 3rd, 2009, 07:38 AM

If its fairly fast you may want to buy a digital to analogue converter and feed the signal in as a 4-20mA signal.

valski gonzaga · June 3rd, 2009, 06:16 PM

Quote:

Originally Posted by mrmss

Depending on wether the CPU has a built in counter - you can use SFB48 "FREQUENC" Frequency Counter its quite straightforward and the help is useful.

could you give an example since SFB48 have a lot of parameters/address to fill in, say I will use a CPU 6ES7312-5BDO1-OABO(Siemens)with 2 channel counting and measuring.

valski gonzaga · June 27th, 2009, 03:03 AM

hellooooooooooooo........

anybody does'nt seem to be answering my query

.....any help please

jvdcande · June 27th, 2009, 05:17 AM

One question first: have you already read the manual? Have you even started to? It's the main error my students used to make. Once they had read the manual, or at least the help items for the concerned block, they suddenly had almost no questions left.

Regards,

valski gonzaga · June 28th, 2009, 06:22 PM

I have done reading the manual....but just asking for an example since the manual doesn't have one...anyway if you find it hard enough to give an example, don't bother....thanks

May 28th, 2009, 01:54 AM	#1
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	siemens plc s7 300 anybody pls provide a how to program analog inputs/outputs for siemens s7 300 PLC, using step7 lite software, thanks

June 3rd, 2009, 07:06 AM	#10
mrmss Lifetime Supporting Member Join Date: Aug 2005 Location: Midlands - England Posts: 100	Depending on wether the CPU has a built in counter - you can use SFB48 "FREQUENC" Frequency Counter its quite straightforward and the help is useful. __________________ Warning: The dates in this calendar are closer than they appear

June 27th, 2009, 03:03 AM	#13
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	hellooooooooooooo........ anybody does'nt seem to be answering my query.....any help please

June 27th, 2009, 05:17 AM	#14
jvdcande Member Join Date: Apr 2002 Location: Menen Posts: 1,948	One question first: have you already read the manual? Have you even started to? It's the main error my students used to make. Once they had read the manual, or at least the help items for the concerned block, they suddenly had almost no questions left. Regards, __________________ Jean Pierre Vandecandelaere Trainer nautical sector VDAB Competentiecentrum L. Blondeellaan 9 B-8380 Zeebrugge Belgium

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May 28th, 2009, 02:00 AM	#2
alekbeck Member Join Date: Mar 2009 Location: Tønsberg Posts: 40	There are a lot of different things to do with a analoge input. What are u trying to achieve in youre program?

May 28th, 2009, 02:06 AM	#3
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	just how to configure it in the program, since I only have program a simple DI/DO only. I do not know how to do it, please help, thanks

May 28th, 2009, 02:19 AM	#4
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	just need to know the addressing of analog inputs and outputs

May 28th, 2009, 04:19 AM	#5
edda Member Join Date: Jun 2008 Location: At the office Posts: 84	Search this forum after FC105 (Scale) and FC106 (Unscale), I´m sure you will find a lot of information about it. Not sure if the same blocks is avalible in Step7 Lite...Have never used that software but you can do it like this in the normal Step7. FC105 lets you convert your analog input (i.e. PIW128) to a real value via the high and low limit. The block "SCALE" is FC105 (You can find it under Standard Library -> TI-S7 Converting Blocks). Here is an example: CALL "SCALE" IN :=PIW128 HI_LIM :=1.000000e+002 LO_LIM :=0.000000e+000 BIPOLAR:=FALSE RET_VAL:=#RET_VAL OUT :=MD10 IN = your analog input (lets say that its set for 4-20mA). HI_LIM = Your highlimit, here set to 100. LO_LIM = Lowlimit = 0. BIPOLAR = If the signal should be bipolar, normally set to false. RET_VAL = Here you can error information, its here set to be written to a temp word. OUT = Here you receive your converted value. So if you got 20mA in the example above you get 100.0 in MD10... And if you got 4mA you will receive 0.0 in MD10. FC106 works the same way just backways =) When using FC105 analog inputs (PIW) and FC106 outputs (PQW) shuld be set to INT in the symboltable. Regards /e

May 28th, 2009, 09:43 AM	#6
hsroomi Member Join Date: Mar 2009 Location: karachi Posts: 49	can anybody explain da same thing on ladder?

May 28th, 2009, 06:25 PM	#8
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	thank you very much edda, I will try this one and keep you posted after testing.regards

June 2nd, 2009, 08:17 PM	#9
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	does anybody seems to now how to program speed indicator using only a proximity sensor and digital input for Siemens S7300 PLC?

June 3rd, 2009, 07:38 AM	#11
PeterW Member Join Date: Jun 2006 Location: Edmonton Posts: 2,418	If its fairly fast you may want to buy a digital to analogue converter and feed the signal in as a 4-20mA signal.

June 28th, 2009, 06:22 PM	#15
valski gonzaga Member Join Date: May 2009 Location: Bacolod City Posts: 37	I have done reading the manual....but just asking for an example since the manual doesn't have one...anyway if you find it hard enough to give an example, don't bother....thanks

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