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SIMATIC S7-200

multiple HMI on PPI

Thread Starter: Anit Kumar   Started: 6/26/2013 8:45 AM   Replies: 7

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  6/26/2013, 8:45 AM
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Can we multiple HMIs with S7-200 on PPI???

What can be the maximum distance between HMI and PLC ??astonished

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  6/26/2013, 8:49 AM
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Hello P,abs,

Perhaps this link might help:
Which HMI components can you connect with S7-200 CPU and what should you watch out for when doing so?

Best regards,

Wizard
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  6/26/2013, 8:52 AM
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could you give me some link regarding distance on PPI??grin

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  6/26/2013, 9:05 AM
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Hello,

I did not found a link about PPI, but I found one about MPI:
What should you watch out for when using the RS485 repeater in PROFIBUS and MPI bus systems?

Here is a link to manual:
S7-200 System Manual
Perhaps you find the information in chapter 7

Best regards,

Wizard
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  6/26/2013, 9:17 AM
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dear P,abs,

what HMI your using ? I thiink if you are using PPI one- to- one connection possible. if you want multiple hmi go with MPI. i done with 2 hmi through MPI .

Murali.R
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  6/26/2013, 10:02 AM
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P,abs wrote:
Can we multiple HMIs with S7-200 on PPI???

What can be the maximum distance between HMI and PLC ??astonished


PPI Means it self Point to Point interface so One Hmi and One PLC we can connect.


viral
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  7/8/2013, 10:14 AM
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viralpatel wrote:


PPI Means it self Point to Point interface so One Hmi and One PLC we can connect.


viral

Dear VP   ..yes and no.
The PPI name can mislead.

The first provided link states it in better language than I can:
wrote:

..the PPI protocol, you can theoretically connect 32 nodes, that is a maximum of 32 HMI devices. However, with PPI in one time interval there is only ever one logical connection between the nodes (time multiplex), which is established and disconnected for each communication.


also..
wrote:

Use Advanced PPI if the master concerned supports it. This type of protocol uses a separate connection like MPI.


Hope it is helpful.
w

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  7/8/2013, 12:16 PM
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Hello


William B
 is right .. you can connect more than one HMI to S7-200.

for example the TD-200 manual shows how you can connect 2 Nos. TD-200 to same S7-200 CPU by defining two seperate parameter blocks in the CPU.

Here is an extract from the S7-200 Manual giving the No of connections possible for S7-200

PPI Protocol

PPI is a master-slave protocol: the master devices send requests to the slave devices, and the slave devices respond. See Figure 7-7. Slave devices do not initiate messages, but wait until a master sends them a request or polls them for a response.

Masters communicate to slaves by means of a shared connection which is managed by the PPI protocol. PPI does not limit the number of masters that can communicate with any one slave; however, you cannot install more than 32 masters on the


S7-200 CPUs can act as master devices while they are in RUN mode, if you enable PPI master mode in the user program. (See the description of SMB30 in Appendix D.) After enabling PPI master mode, you can use the Network Read or the Network Write instruction  to read from or write to other S7-200s. While the S7-200 is acting as a PPI master, it still responds as a slave to requests from other masters. PPI Advanced allows network devices to establish a logical connection between the devices. With PPI Advanced, there are a limited number of connections supplied by each device.

All S7-200 CPUs support both PPI and PPI Advanced protocols, while PPI Advanced is the only PPI protocol supported by the EM 277 module.


Module Baud Rate Connections


S7-200 CPU Port 0 9.6 kbaud, 19.2 kbaud, or 187.5 kbaud -
No of Connections = 4

Port 1 9.6 kbaud, 19.2 kbaud, or 187.5 kbaud
No of Connections =4


EM 277 Module 9.6 kbaud to 12 Mbaud
No of Connections =6 per module

I have also attached the page extract from S7-200 panel for ready reference

Hope this helps

Cheers

Navnag


Attachment: S7-200_PPI_Protocol.pdf  (19 Downloads)



=== Edited by Navnag @ 7/8/2013 12:17 PM [GMT ] ===



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