Read and write data from pc to plc via rs232 cable - PLCS.net

MANISH VORA · June 7th, 2009, 06:19 AM

Hi, PLC experts, I have a application to develop in which I am to read and write values from a DELTA PLC from my PC which is connected through RS232 ( Comport 1 )l, I have some details of PLC configuration like how to configure Comport 9600,7,E,1
Now, I want to read some value stored in PLC's Data Register like D440 ( memory address ) and want to update it ( write new value in it )
I am using VFP / VB for my frontent development tool.
Pl. guide me... if anyone has any idea about it..

How to send input to PCL ( in binary / HexDecimal / Ascii ) format ?

I have got information from PLCS.net, like
to pass ":" - start string
"01" - slave address
"01" - Command option
"05" -
"14" - Memory Address (starting memory location)
"02" -
"A8" - Memory Address (ending memory location)
"DA" - LRC Check
"CR" - Cerrage Return
"LF?" - Line Feed for ending string
I have tried with above string in Hex format and ascii format, but didn't get any reply ( indication on plc ) from plc.

Pl. Help me as earliest... It is matter of my New Job....Thanks

userxyz · June 16th, 2009, 10:27 AM

"01" - slave address
"01" - Command option
"05" -
"14" - Memory Address (starting memory location)
"02" -
"A8" - Memory Address (ending memory location)
"DA" - LRC Check
"CR" - Cerrage Return
"LF?" - Line Feed for ending string

This Above is Char data. Look for an Ascii table.

In Hex it's something like:
31 - slave address
31 - Command option
.
.
.
D - Cerrage Return
A - Line Feed for ending string

Try to send from the PLC to the PC (hyperterminal) first !

Quote:

Originally Posted by MANISH VORA

Hi, PLC experts, I have a application to develop in which I am to read and write values from a DELTA PLC from my PC which is connected through RS232 ( Comport 1 )l, I have some details of PLC configuration like how to configure Comport 9600,7,E,1
Now, I want to read some value stored in PLC's Data Register like D440 ( memory address ) and want to update it ( write new value in it )
I am using VFP / VB for my frontent development tool.
Pl. guide me... if anyone has any idea about it..

How to send input to PCL ( in binary / HexDecimal / Ascii ) format ?

I have got information from PLCS.net, like
to pass ":" - start string
"01" - slave address
"01" - Command option
"05" -
"14" - Memory Address (starting memory location)
"02" -
"A8" - Memory Address (ending memory location)
"DA" - LRC Check
"CR" - Cerrage Return
"LF?" - Line Feed for ending string
I have tried with above string in Hex format and ascii format, but didn't get any reply ( indication on plc ) from plc.

Pl. Help me as earliest... It is matter of my New Job....Thanks

mkashifk · June 8th, 2011, 08:00 AM

hi
i have read all of your threads , did you find any thing regarding plc to pc interfacing through VB .
i am working on this,
best regards
mkka

paul56 · August 22nd, 2011, 10:41 PM

Try Advanced HMI from sourceforge.net . Examples are also provided.

mkashifk · August 23rd, 2011, 02:47 PM

ok, i have found the procedure to communicate Delta plc from pc through VB .

June 7th, 2009, 06:19 AM	#1
MANISH VORA Member Join Date: Jun 2009 Location: RAJKOT - GUJARAT Posts: 2	Read and write data from pc to plc via rs232 cable Hi, PLC experts, I have a application to develop in which I am to read and write values from a DELTA PLC from my PC which is connected through RS232 ( Comport 1 )l, I have some details of PLC configuration like how to configure Comport 9600,7,E,1 Now, I want to read some value stored in PLC's Data Register like D440 ( memory address ) and want to update it ( write new value in it ) I am using VFP / VB for my frontent development tool. Pl. guide me... if anyone has any idea about it.. How to send input to PCL ( in binary / HexDecimal / Ascii ) format ? I have got information from PLCS.net, like to pass ":" - start string "01" - slave address "01" - Command option "05" - "14" - Memory Address (starting memory location) "02" - "A8" - Memory Address (ending memory location) "DA" - LRC Check "CR" - Cerrage Return "LF?" - Line Feed for ending string I have tried with above string in Hex format and ascii format, but didn't get any reply ( indication on plc ) from plc. Pl. Help me as earliest... It is matter of my New Job....Thanks

June 8th, 2011, 08:00 AM	#3
mkashifk Member Join Date: Mar 2007 Location: karachi Posts: 9	DELTA PLc hi i have read all of your threads , did you find any thing regarding plc to pc interfacing through VB . i am working on this, best regards mkka

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August 22nd, 2011, 10:41 PM	#4
paul56 Member Join Date: Jul 2007 Location: Karnataka Posts: 50	Try Advanced HMI from sourceforge.net . Examples are also provided.

August 23rd, 2011, 02:47 PM	#5
mkashifk Member Join Date: Mar 2007 Location: karachi Posts: 9	ok, i have found the procedure to communicate Delta plc from pc through VB .

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