Configuring IPC477D to S7-1200 Ethernet Connection in TIA Portal V14 SP1

The SIMATIC IPC477D panel PC and the S7-1200 CPU family (in this case the fail-safe S7-1215FC DC/DC/DC) form a common SCADA/HMI pairing on the plant floor. Both devices ship with a PROFINET interface, so the physical link is trivial — the engineering effort is entirely in software: IP addressing, the Windows PG/PC Interface assignment, and the TIA Portal connection resource. This reference walks through every step, including the ASCII-only TSAP rule that the official Siemens documentation calls out for passive partners on ISO-on-TCP.

1. Hardware Overview and Order Numbers

Before touching any software, confirm the exact hardware revision. The PROFINET controller firmware must be compatible with the TIA Portal version; TIA Portal V14 SP1 corresponds to S7-1200 firmware 4.x and IPC477D image releases that predate the V15 migration.

1.1 SIMATIC IPC477D

The IPC477D is a 15" to 22" all-in-one panel PC based on Intel Celeron, Core i3, or Core i5 (Skylake/U-series) hardware, equipped with an onboard PROFINET interface on port X1 (and an optional second PROFINET/ethernet port X2 on the -2X variants). Operating system is typically Windows Embedded Standard 7 (WES7P) or Windows 10 IoT Enterprise 2016/2019 LTSB.

1.2 S7-1215FC DC/DC/DC

The fail-safe S7-1215FC is the PROFIsafe-capable variant of the S7-1215. It has two PROFINET ports: X1 P1 (with switch, the default PROFINET interface) and X1 P2. The default IP out of the box is 0.0.0.0 (no IP) until a project is loaded; the MAC address is printed on the front flap.

2. Prerequisites

Confirm the following before proceeding — any one of these missing causes a "cannot reach partner" or "connection refused" error that looks like a software bug but is actually a configuration miss.

1. TIA Portal V14 SP1 with update 7 (or later within the V14 service pack) installed on the IPC477D. The installation media are part of the SIMATIC TIA Portal DVD; ensure the SIMATIC IPC support package is also installed (this includes the correct Realtek NDIS driver and PG/PC interface templates).
2. S7-1200 CPU with firmware version 4.0 to 4.4. TIA Portal V14 SP1 does not program FW 4.5 or 4.6 — that requires TIA V15.1 or later.
3. Ethernet patch cable Cat 5e or better, ≤ 100 m. PROFINET requires 8P8C (RJ45) wired 1:1 or crossover; modern NICs auto-MDIX so either is fine.
4. Subnet plan. Both devices must share the same subnet. Recommended baseline: 192.168.0.1/24 for the PLC and 192.168.0.10/24 for the IPC477D. Subnet mask 255.255.255.0.
5. Windows administrator account on the IPC477D. Changing the PG/PC interface and clearing the Windows Firewall requires elevation.
6. S7-1200 project file in TIA Portal with the CPU already configured (IP, subnet, PROFINET device name). If you do not yet have a project, the initial connection is set up via the TIA Accessible Nodes scan.

3. Physical Connection and Link Verification

1. Power the S7-1215FC, then connect X1 P1 to the IPC477D's PROFINET port X1.
2. Check the link LEDs: the S7-1200 LINK LED must be solid green; the IPC477D's NIC port LED must be solid green (link) plus flashing yellow/green (activity).
3. On the IPC477D, open Control Panel → Network and Sharing Center → Change adapter settings. Confirm the PROFINET adapter shows Enabled and is not in Disable state (a common mistake after image restore).
4. Right-click the PROFINET adapter → Status → verify the IPv4 speed shows 1 Gbps (or 100 Mbps on Celeron variants). Anything showing No Connection means the physical layer is broken.

4. IP Address Configuration on the S7-1200

If the S7-1200 has not yet been assigned an IP, use TIA Portal's Online & Diagnostics view, or — if you only have the IPC477D and no programming device — temporarily set the IP via the S7-1200's Display (CPU with display) or via the PRONETA tool from Siemens.

1. In TIA Portal, project tree → expand Online access.
2. Select the IPC477D's PROFINET adapter (the one physically connected to the PLC). Right-click → Update accessible nodes.
3. The MAC address of the S7-1215FC will appear with IP 0.0.0.0.
4. Right-click the S7-1200 entry → Assign PROFINET device name. The device name (e.g., plc-line-1) must match the one in your TIA project, otherwise PROFINET IO will not start even if the IP is correct.
5. Right-click the S7-1200 → Assign IP address. Set 192.168.0.1, subnet mask 255.255.255.0. Leave router empty.

5. PG/PC Interface Assignment (Windows Control Panel)

The most common reason the IPC477D cannot reach the S7-1200 is that the TIA Portal runtime is bound to the wrong Windows access point. The TIA Portal Online menu and the S7-1200 PUT/GET HMI driver both look at the PG/PC Interface dialog in the classic Windows Control Panel.

1. Open Control Panel → Set PG/PC Interface (on Windows 10 IoT, search for PG/PC in the Control Panel search box).
2. The Access Point of the Application dropdown defaults to S7ONLINE. Leave it.
3. In Interface Parameter Assignment Used, select the Realtek adapter that is physically wired to the S7-1200 — typically labeled Intel(R) Ethernet Connection I219-V or Realtek PCIe GBE Family Controller.
4. Click Properties:
   • IP protocol: TCP/IP
   • Confirm the Windows-assigned IP of the IPC477D is in the same subnet as the PLC (e.g., 192.168.0.10 / 255.255.255.0).
5. Click OK → OK to commit.

6. Verify the Link with Ping

Before opening TIA Portal, prove layer-3 reachability. Open a Windows command prompt with administrator rights:

Expected output:

Pinging 192.168.0.1 with 32 bytes of data:
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64

If the ping times out (Request timed out or Destination host unreachable):

1. Verify the IP of the IPC477D with ipconfig /all.
2. Verify the IP of the PLC by re-running Update accessible nodes in TIA Portal.
3. Disable the Windows Firewall temporarily: netsh advfirewall set allprofiles state off. If ping now works, the firewall is the culprit — re-enable it and add an inbound rule for TCP port 102 (S7 communication) and UDP port 34964 (PROFINET DCP).
4. Confirm no second NIC on the IPC477D is hijacking the route: route print → look for a 0.0.0.0 default gateway pointing at the wrong adapter.

7. TIA Portal Project Setup and Online Connection

7.1 Configure the PROFINET Interface in the Project

1. Open the TIA Portal V14 SP1 project containing the S7-1215FC station.
2. Project tree → Devices & networks → select the S7-1200 CPU.
3. In the Properties → PROFINET interface [X1] tab, set:
   • IP address: 192.168.0.1
   • Subnet mask: 255.255.255.0
   • PROFINET device name: plc-line-1 (must match what was assigned in Step 4)
4. Compile and download to the PLC. After the download, the PLC restarts its PROFINET stack — wait until the MAINT/BF LEDs go off.

7.2 Go Online

1. Select the S7-1200 CPU in the project tree.
2. Click the Go online button (or press Ctrl+O).
3. If the connection establishes, the status bar at the bottom turns green and shows the online partner address. The CPU icon gains a small orange "online" indicator.
4. If the connection fails, the Go online dialog lists all reachable nodes. Select 192.168.0.1 → Go online.

8. Configuring the ISO-on-TCP Connection Resource (TSAP Rules)

When the IPC477D needs a programmatic connection — for example, an OPC UA server, a custom .NET client using the S7.NET library, or a non-TIA application — you must configure an S7 connection or an ISO-on-TCP connection. The TSAP (Transport Service Access Point) is the addressing primitive for ISO-on-TCP and is the most common source of connection failure once IP and ping are healthy.

8.1 TSAP Format

The TSAP is two bytes, typically expressed in dot notation: aa.bb.

• First byte (aa): Connection resource on the local device. For an S7-1200 the default is 01 (CPU 1, slot 0). For OP/HMI connections, the first byte is often 03.
• Second byte (bb): Sub-slot or connection end-point identifier. 01 = slot 1 (CPU).

Standard TSAPs:

8.2 ASCII-Only Rule for Passive Partners

Therefore, do not enter Unicode, extended-ASCII, or non-printable characters into the TSAP field. Stick to 01–7F ASCII. The TIA Portal UI enforces this when the dropdown is used, but a raw .s7c file edited in Notepad can bypass it — verify after any manual edit.

8.3 Configuring the Connection in TIA Portal

1. Project tree → Devices & networks → Network view.
2. Click Connections at the top → select S7 connection.
3. Drag a connection from the S7-1200 CPU to the IPC477D's HMI/RT entry.
4. In the connection properties:
   • Type: S7 connection
   • Local end point: the S7-1200 CPU, TSAP 03.01
   • Partner end point: the IPC477D HMI, TSAP auto-assigned
5. Compile the project (HMI + PLC) and download to both devices.

9. Verification Checklist

Run this checklist end-to-end after every change. Each item must be green before declaring the link operational.

10. Troubleshooting Matrix

11. Common Diagnostic Buffer Entries on S7-1200

When the S7-1200 logs a connection event, the diagnostic buffer entry is a reliable indicator:

12. Reference: ISO-on-TCP Connection Resource Limits on S7-1200

The S7-1200 supports a fixed number of open connections, divided between PG, OP/HMI, and S7/user-defined. CPU properties → Communication tab exposes the limits:

Hit the limit and you will see 0x80A2 — no more connection resources. Reduce the number of simultaneously open WinCC RT screens, or upgrade to a larger CPU (S7-1217).

13. Frequently Asked Questions