Siemens S7 200 Plc Connection

[Carol Gudes]

Thisis on a system I walked into. No changes made that I am aware of. Everything appears to be working fine. Avg scan time on controller is 6msec with a max of 30msec (there is some modbus comms so I can see the 30msec occasionally). Anywho, no much info I can find on overload sender alarms. Am curious how I can inspect these connection ID's 16#3 & 16#4. Is there someplace I can see these connections and what they are used for? Not seeing any such reference in netpro. Wondering if anyone has any insight on possible causes of these alarms. Have tried bumping the scan cycle load from 20% to 30% with no improvement. Thank you for any thoughts/ideas!

I tried deleting all the profibus and ethernet connections for the afflicted controller, compiling then re-adding those connections. But that did not seem to help any. These overload sender alarms are over running our alarm and journal screens. I hate to just disable the message, something is going on. I may try replacing the controller just to rule out any hardware issue.

I have a TIA V14 project and was trying to download the project to running CPU 1512SP F. Unfortunately the connection was interrupted during the downloading. The PLC is still running and I don't want to interrupt the production. Now when I try to connect to the PLC it tells me that "Online: Cannot establish the connection. Too many users have made an online connection to the device." I can ping the PLC via both ports but I cannot go online.

Connect to a "Device" from Ignition gateway, as indicated in Siemens - Ignition User Manual 8.1 - Ignition Documentation. A big disadvantage of this is that The access level must be "full", what leaves the PLC unprotected.

Use Ignition as an OPC UA client to the OPC UA Server embedded in the PLC, as indicated in OPC UA Client Connection Settings - Ignition User Manual 8.1 - Ignition Documentation. Will I have access (read and write) to all the tags published in the PLCs OPC UA Server easily? Are there any disadvantages or special considerations I am missing?

We've got plans to evaluate a 3rd party library... some day... and if that works out we'll build a new driver around it. If it doesn't work out for some reason, then no. Siemens doesn't document S7 or S7+ and their official stance on interoperability is to use OPC UA.

Hi @g.cascales,

you shouldn't have any issues reading arrays from an OPC device, so it's really strange. An OPC connection to a Siemens S-1200/1500 PLC is usually pretty straightforward.

But let me understand why you have implemented a server interface in the PLC? Have you tried to read the same array via generic interface?

I have implemented a server interface because the PLC is acting as an OPC UA server, and it is the way to expose the tags to be accessed by clients. It is the only way I know to share tags when PLC is acting as an OPC UA server.

My bad, I've seen now that you're working on a S7-1200 that requires a Server Interface defined. On S7-1500 there's no need at first as you can enable the Generic Siemens Interface (that's what I was referring to).

I'm more familiar with 1500 family thus I'm not aware if there are some incompatibilities with OPC on 1200 platform.

As testing purpose, have you tried to access to the same NodeId with another client, eg UAExpert?

@Davide_Bortolini I tried with UaExpert and seems that the array itself does not have a dedicated NodeId, but each element of the array has a NodeId. Do not know if this is the reason that I cannot get the whole array into a tag in Ignition.

Have you tried declaring a Companion specification with the help of SIOME ? -opc-ua-modeling-editor-(siome)?dti=0&lc=en-CA

It is way more tedious but it enables you to specify string for the nodes ids which works way better in Ignition and especially with UDTs.

I've never had to deal with arrays from PLC to Ignition so can't tell but it might help you.

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I have a problem between my plc and robot. I have a siemens plc s1500 and a fanuc robot, im trying to comunicate them with ethernet ip. I have follow all the steps but i cant comunicate the plc with the robot, both of them are in the same ip range and i can ping each one from the computer. Also i can ping the plc from the robot. The plc is the scanner and the robot is the adapter

In the Fanuc robot, the ethernet ip connection is online but not running. I have checked all the EDS data from the robot and i am sending thease values correctly from the plc. Also the tcp/ip connection has been initialized.

I have a 1517TF-3 plc with v2.0 firmware, im using tia portal v15.1 and the robot controller is Fanuc R-30iB Plus. Im trying to communicate the plc with the robot using ethernet ip. In Tia portal im using LCCF enetScanner block, the plc works as scanner and the robot as adapter. Im sending to the robot the IP address, vendor identifier, product type,...

The robot is configured to work in rack 89 and slot 1, also it has the ip address and it communicates with the plc. But in the plc the scanner active signal is always off. The ethernet ip connection is activated and the status is online, but is not running, im using the first connection.

May I ask, where you get the "RPI >= 32 ms" from? I am currently configurating a Fanuc Siemens connection with this function block and did not find this value in any of the manuals. Is this something you have found out by experiments?

RPI for PLC side. Use "packetinterval" parameter of Function block. You can found parameter in instance DB of FB. If you using RPI less than 32 connection problems occured randomly. Because Siemens PLC is not powerfull CPU for Ethernet/IP

S7-1500 manages to support EIP Communication, S7-1200 does not have enough power (communicates but when loading a new configuration in the PLC, the communication drops). For me, the main problem was the incorrect configuration of the input and output registers on both sides (Robot and PLC). In the robot, the registers are 16 bits, while in the S7 they are 8 bits.

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