I'm trying to establish communication between an S7-1200 PLC 1214C DC/DC/DC to connect to an S7-1500 S7-1516 3-PN/PD using the  ISO on TCP connection, but I'm not receiving the lifebeat bit signal on either end.  
My issue: The lifebeat bits (Bit15 in byte 11) aren’t changing on either PLC, indicating the data transfer isn’t working.

Yes, I will be sending a screenshot of the connection parameters and the Documents to help understand the project.
 

I’m working on a communication setup between two Siemens systems using ISO-on-TCP. The setup is based on the signal-exchange PDF included in the Google Drive link I shared.

In this configuration, the cooling unit (my station — referred to as M2) must communicate with the mixer (M1). The goal is simple:

• From M1 → M2, I need to correctly receive:
  • Enable: coolant
  • Lifebeat bit
• From M2 → M1, I need to correctly send:
  • Request: coolant
  • Lifebeat bit

I have already created the communication DBs and written an SCL program for the S7-1214C (M2). Everything has been connected via Ethernet, but the two stations are still not communicating.

I’ve uploaded my full project (including the SCL block and the communication PDF) in the provided Google Drive ZIP. If you could please take a look and point out what I may have configured incorrectly in the ISO-on-TCP setup or telegram handling, I would greatly appreciate your help.

Thank you.
 

In this setup, the cooling station (M2, my station) contains two pump drives that must supply coolant when commanded. The mixer (M1) sends and receives the required signals.

Hello,

I’m working on an ISO-on-TCP communication setup between two Siemens systems. The project files, including my SCL program and the official signal-exchange PDF, are included in the Google Drive link I shared.

In this setup, the cooling station (M2, my station) containstwo pump drivesthat must supply coolant when commanded. The mixer (M1) sends and receives the required signals.

The communication requirements are:

From M1 → M2 (Cooling station):

• Enable: coolant

• Lifebeat bit

From M2 → M1 (Mixer):

• Request: coolant(based on the two pump drives being ready)

• Lifebeat bit

I have created all communication DBs and an SCL block for the S7-1214C, and both PLCs are connected via Ethernet, but communication never establishes.

If you could review the program and PDF in the ZIP file and help identify what I may have configured incorrectly in the ISO-on-TCP or telegram handling, I would greatly appreciate it.

Thank you.

Hello,

from your screenshot about Connection definition I don't see nothing wrong but what most important is are screenshots from used Comm blocks and also from 2-nd PLC cfg, especially from Connection definition. Ok, in case you have some doubts, you can also change signals manually and check change of them on both sides. problem is, if your data are not changed on send PLC, then it is logically impossible to see changes on receive side. You can also check some TAGs/options inside Connection/comm blocks where you can see maybe Connection established indication, this can be interesting to see if you have established. Maybe then problem can lies at other place...

I don't have access to higher versions of TIA so screenshots (ZIP-ed) are welcome...

samuel_rufus154

I'm trying to establish communication between an S7-1200 PLC 1214C DC/DC/DC to connect to an S7-1500 S7-1516 3-PN/PD using the  ISO on TCP connection, but I'm not receiving the lifebeat bit signal on either end.  
My issue: The lifebeat bits (Bit15 in byte 11) aren’t changing on either PLC, indicating the data transfer isn’t working.

 Hi there,

to get that coomunication working:

1. you should add the partner plc in TIA portal project.
2. then follow comments located at the picture I attached to the post.

p.s. I am curious why dd you not consider S7communication, the partner is not third party after all.