<P>I want to interface a dmx controller with a siemens simatic plc s7.the dmx controller has RS 232 serial port in it.The dmx controller accepts serial port commands.The serial port commands are standard ASCII characters.The plc is monitored and controlled by a remote SCADA system.Please tell me a way in which this DMX controller can be interfaced.</P>
interfacing plc with dmx controller
- Thread starter arclivin
- Start date
<P>I want to interface a dmx controller with a siemens simatic plc s7.the dmx controller has RS 232 serial port in it.The dmx controller accepts serial port commands.The serial port commands are standard ASCII characters.
eg"i00" for status
"a00" for starting a show
The plc is monitored and controlled by a remote SCADA system.Please tell me a way in which this DMX controller can be interfaced.
KalleOlsen
Member
1: You don't tell which S7-type.
2: You don't tell which programming environment (TIA, Step7, MicroWin(or whatever the S7200 software is called)).
Firstly I would try to hook up the DMX with hyperterminal to investiate how the queries respond.
Secondly you need a RS232 interface card on your S7.
There are such cards for several S7 card types, so you must consider the most appropriate variant for your system.
If you are running Step7 classic, you'll probably find an example project on serial comm. on your PC (Step7 Manager:File/Open/Examples/..).
The more adequate info, the better answers.
Kalle
2: You don't tell which programming environment (TIA, Step7, MicroWin(or whatever the S7200 software is called)).
Firstly I would try to hook up the DMX with hyperterminal to investiate how the queries respond.
Secondly you need a RS232 interface card on your S7.
There are such cards for several S7 card types, so you must consider the most appropriate variant for your system.
If you are running Step7 classic, you'll probably find an example project on serial comm. on your PC (Step7 Manager:File/Open/Examples/..).
The more adequate info, the better answers.
Kalle
The DMX controller already works with a hyperterminal software
The DMX controller is from gilderfluke and the name is dac quad
The hypersoftware terminal software name is gilderfluke or it works with any terminal software
The PLC is SIEMENS S7400,Programming MICROWIN
KalleOlsen
Member
<P><IMG class=inlineimg border=0 alt=0 src="http://www.plctalk.net/qanda/images/smilies/pray.gif" smilieid="54">
</P><P>Â sorry the software is s7 the plc works as reduntant plc as a part of Scada system</P>
KalleOlsen
Member
1: Are we talking about an S7 H-system?
2: What do you mean with DMX? What is it?
Where do you (intend to) put your S7 RS232 interface card? In the S7 main rack, in a sub-rack, on a DP-node?
Should the DMX be a part of the redundancy?
2: What do you mean with DMX? What is it?
Where do you (intend to) put your S7 RS232 interface card? In the S7 main rack, in a sub-rack, on a DP-node?
Should the DMX be a part of the redundancy?
KalleOlsen
Member
Check this post from the Siemens forum:
http://www.automation.siemens.com/forum/guests/PostShow.aspx?PostID=434750&language=en&PageIndex=1
It should be relevant for you if you rubber out all about the Modbus protocol.
K
http://www.automation.siemens.com/forum/guests/PostShow.aspx?PostID=434750&language=en&PageIndex=1
It should be relevant for you if you rubber out all about the Modbus protocol.
K
If the 'status' command ('i00') is sent to the DAC-QUAD, it will respond with several lines of text that the PLC can parse.
The connection is a standard nine pin Rs-232 port.
The PLC can also request and play shows through this same port using simple ASCII commands.
All of this is fully documented in the DAC-QUAD's Manual.
The manufacture of the DMX Controller DACQUAD is saying the above things.
This DMX Controller needs to be interfaced with the SIEMENS S7 400 PLC having STEP7 software running on it.This DMX Controller is actually controlling a musical fountain.
This fountain is part of a big project which is monitored all together by a SCADA system.The above said PLC is a part of that SCADA system.
The manufacturer of the controller has already provided the serial port commands that can be used to start,stop and generally control the DACQUAD through it's serial port.The serial port commands can be used as the sole method to control the DACQUAD.
Actually the serial port of the controller is accessed from any computer running just about any modem or terminal program.
My main purpose is to interface this serial port of the DMX controller to the PLC and PLC to send these commands and receive the response.
This is the situation
KalleOlsen
Member
Did you bother to read the link to the Simatic forum that i posted earlier?
You can have your serial card in the main 400-rack (CP441), in a 300 substation (CP341) or in an ET200S substation (138-4DF01). All the serial cards can send and respond to your DMX, but there are different FB's to be used dependant of which card type you choose.
The commands you want to send, must (could) be predefined in a command-datablock. The FB-Send must then be called with pointer to the wanted command and triggered.
Kalle
kalle is correct please have a serial card on the PLC.
some manufacturers even have a dmx controller card.
T-mac Technologies produces Modbus RTU (RS-485) to DMX512 (RS-485) gateway so it would be able to Modbus RTU supported PLC (Siemens, GE, Schneider) to control DMX512 supported device.
http://www.t-mac.co.uk/index.php/products/protocol_converters/dmx_i nterface
for example.
easier is to use a arduino, but hey it is working.
some manufacturers even have a dmx controller card.
T-mac Technologies produces Modbus RTU (RS-485) to DMX512 (RS-485) gateway so it would be able to Modbus RTU supported PLC (Siemens, GE, Schneider) to control DMX512 supported device.
http://www.t-mac.co.uk/index.php/products/protocol_converters/dmx_i nterface
for example.
easier is to use a arduino, but hey it is working.
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