11/13/2010 10:54 PM | |
Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684) |
Hello Tomy; Based on this FAQ, you cannot connect more than one TDxxx to a S7-200, because they act as PPI masters in this configuration: http://support.automation.siemens.com/WW/view/en/14188898 However, you will find this notice at the bottom of the FAQ: In the case of 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. The baud rate is max. 187 kbit/s. This practically reduces the number of HMI devices to three per interface. Now, in PPI mode, if several HMI devices (PPI masters) access the CPU (PPI slave), it might happen that an HMI device constantly arrives at the CPU that is occupied by another HMI device (or by another PPI master) and is no longer updated. In this case, you should increase the update cycles of the HMI devices. You do this in the relevant configuration tools of the HMI devices or with the text displays TD 100/200(C) in the Micro/WIN text display wizard. So I am a little confused... Let's hope that someone whoi has done this recently can lend a hand. Hope this helps, Daniel Chartier |
11/13/2010 11:03 PM | |
Joined: 5/4/2009 Last visit: 5/28/2024 Posts: 914 Rating: (40) |
So, do you recommend not to do it? |
Aim Higher |
|
11/14/2010 2:02 AM | |
Joined: 9/27/2006 Last visit: 9/19/2024 Posts: 12282 Rating: (2684) |
Hello Tomy; In all projects where I have worked with a TDxxx panel, I hadalways workedas a one CPU-one panel setup. But available information from Siemens states that you can connect more tahan one TD per CPU, or more than one S7-200 oer TD unit. See, for example: S7-200 System Manual: Each TD device functions as a network master when it is connected over a network that contains one or more S7-200 CPUs. The TD device is also designed to operate with other masters in a network. Multiple TD devices can be used with one or more S7-200 CPUs connected to the same network. More than one TD device can connect to the same S7-200 CPU.
http://support.automation.siemens.com/WW/view/en/1087140 Appendix B: Connecting multiple devices on a network So I would go ahead, but I would keep in mind the settings proposed in my first post. Hope this helps, Daniel Chartier |
This contribution was helpful to1 thankful Users |
Follow us on