Siemens LOGO! 8 to KP300 Basic Mono HMI: Complete TIA Portal Configuration Guide

The Siemens LOGO! 8 (6ED1052-xxxxx-xxxx, 0BA8 generation) and the SIMATIC KP300 Basic mono PN (6AV6 647-0AH11-3AX0) form a compact, cost-effective automation stack for small machines, building services, and educational cells. Unlike the LOGO! TD (Text Display) which is limited to four function keys and a 4-line text interface, the KP300 offers a 3-inch pixel-graphics monochrome display, ten programmable function keys, trend views, alarm logging, and full WinCC Basic screen design. The trade-off is configuration complexity: the connection must be set up inside TIA Portal (WinCC Basic) rather than the LOGO! Soft Comfort drag-and-drop tool used for the TD.

This guide walks an engineer through hardware selection, IP planning, TIA Portal project structure, WinCC screen design, download, and verification, and finishes with a structured troubleshooting matrix covering the most common commissioning failures (mismatched subnet, wrong protocol, missing HMI connection in the project tree, and firmware incompatibilities).

1. Hardware Overview and Part Numbers

1.1 LOGO! 8 Base Module (0BA8)

The LOGO! 8 system (order prefix 6ED1052) is the first LOGO! generation with a built-in Ethernet interface on every Base Module (BM). Relevant catalog numbers:

The Ethernet port on every LOGO! 8 BM operates at 10/100 Mbit/s, supports Auto-MDI/MDIX (any standard patch cable works), and exposes the controller as a S7-communication server on TCP port 102. The BM is not a switch — only one device can be cascaded without an external switch.

1.2 KP300 Basic mono PN

Why use the KP300 instead of the LOGO! TD? Three reasons: (1) ten function keys instead of four, (2) trend and alarm views, and (3) user-defined screen layout (text, bitmaps, bar graphs, IO-fields) which is impossible on the character-based TD.

1.3 Required Cables

• PC ↔ LOGO! 8: standard Ethernet patch cable (Cat 5e or higher), straight-through. Auto-MDIX on the LOGO! side means crossover is not required.
• PC ↔ KP300: same — Ethernet patch, RJ45-RJ45, max 100 m segment length.
• LOGO! 8 ↔ KP300: same — Ethernet patch, RJ45-RJ45. If both devices are powered off, no crossover is needed thanks to Auto-MDIX on both units.
• LOGO! 8 ↔ Switch ↔ KP300: recommended topology. Use an unmanaged 100 Mbit switch (e.g., Siemens SCALANCE XB005) when the PC must remain connected for online diagnostics.

2. Network Architecture and IP Planning

The KP300 and the LOGO! 8 must reside on the same IP subnet, and the TIA Portal project must be configured with an HMI connection of type "SIMATIC LOGO! 8" using the S7 protocol on TCP/102. Before touching the project, decide on the addressing scheme.

2.1 Recommended Address Plan

2.2 Topology Options

3. Prerequisites

1. LOGO! 8 0BA8 BM with firmware >= FS:03 (use the LOGO! display menu to check: LOGO! > Diagnostics > Versions). FS:01/02 are still in the field but have known connection-drops with V14+ WinCC. Upgrade to FS:04 or later for the most stable S7 sessions.
2. KP300 Basic mono PN 6AV6 647-0AH11-3AX0 (image version V13.0.0.0 or later). The image version is shown on the loader screen at boot: System > Information > Image Version.
3. TIA Portal with WinCC Basic installed. The minimum version depends on the LOGO! 8 firmware: TIA V13 SP1 + HSP for LOGO! 8 supports FS:01/02/03; TIA V16 supports up to FS:04; TIA V18 supports FS:05 and FS:06 (LOGO! 8.3 / 8.4). Download the matching Hardware Support Package (HSP) from the Siemens HSP download page (Entry ID 72341852).
4. Ethernet switch (optional but recommended) and three patch cables.
5. 24 V DC power supply capable of 1.5 A (enough for both LOGO! 8 BM and KP300 from a single 24 V bus).
6. Admin rights on the engineering PC — required to change the PG/PC interface and to install TIA Portal.

4. TIA Portal Project Setup

4.1 Create the Project

1. Start TIA Portal. Create new project → name it (e.g. LOGO8_KP300_Demo) → set project path → Create.
2. In the portal view switch to the project view: View > Project view.
3. Add a SIMATIC LOGO! 8 device:
   Project tree → Devices & Networks → double-click Add new device → SIMATIC LOGO! 8 > LOGO! 8 12/24RCE (or whichever BM you have). Confirm the version matches the firmware (e.g. 6ED1052-1CC08-0BA0 V1.8.x.x).

4.2 Configure the LOGO! 8 IP

1. In the project tree open LOGO! 8 BM > Properties > General > PROFINET interface [X1] > Ethernet addresses.
2. Set IP address = 192.168.0.1, Subnet mask =

   255.255.255.0. Leave Use router unchecked unless you really need cross-subnet access.

3. Tick Use IP protocol S7 (this is the default).

4.3 Add the KP300 to the Project

1. Project tree → double-click Add new device → SIMATIC HMI > KP300 Basic > KP300 Basic mono PN → 6AV6 647-0AH11-3AX0, version V13.0.0.0 or later.
2. Open HMI_1 [KP300] > Properties > General > PROFINET interface [X1] > Ethernet addresses → set IP address = 192.168.0.20, Subnet mask =

   255.255.255.0.

4.4 Wire the HMI Connection

1. Open Devices & Networks → select the Network view tab.
2. Click the LOGO! 8 BM. A small connection-handle appears at the right edge of the device.
3. Drag a line from the LOGO! 8 handle onto the KP300. A new HMI connection is created.
4. Select the new connection line. In the Properties > General > Connection pane verify:
   • Type: HMI connection
   • Partner (HMI): KP300
   • Partner (PLC): LOGO! 8 BM
   • Interface: PROFINET / S7
5. In Properties > HMI connection > Connection path the access point should be S7ONLINE and the partner address should be 192.168.0.1 (the LOGO! 8 BM). If the address reads 0.0.0.0, the HMI connection has not actually bound to the LOGO! 8 — see the troubleshooting matrix below.

5. LOGO! 8 Program (Tags and Blocks)

Before designing the HMI screens, expose at least one variable to the HMI. The KP300 can read inputs (I1…I24), outputs (Q1…Q16), markers (M1…M64), and the current values of the LOGO! built-in function blocks (e.g. counter values, on-delays, analog thresholds). The naming convention in the TIA Portal HMI tag list differs from LOGO! Soft Comfort; the table below summarizes the mapping.

To expose a writable HMI tag, the LOGO! program must read the variable memory area. The following is a minimal "soft-starter" logic in LOGO! Soft Comfort that uses VW0 to receive a start command from the KP300 and writes back the motor state to VW1.

[LOGO! Soft Comfort — Function Block Diagram excerpt]

  VW0 (Int) --[ > 0 ]--( B001: AND )--( B002: RS flip-flop )---- Q1 (motor contactor)
                                            |
                                            +--- VW1 := 1   (write 1 when running)

  I1 (Start PB) ---+                       ( B003: NOT )-- VW1 := 0  (when stopped)
  I2 (Stop PB) ----+--( B004: OR )

The HMI tag definitions in TIA Portal are:

6. WinCC Basic Screen Design

1. Open HMI_1 [KP300] > Screens > Add new screen (Root screen, 240 × 80 px).
2. From the Toolbox palette drag:
   • One Text field (header, e.g. "Process Overview")
   • Three IO fields: cmd_start, state_motor, ai_pressure
   • Two Buttons (F1 → start, F2 → stop) — these will write 1 or 0 to cmd_start
   • One Bar element bound to ai_pressure (range 0…1000)
   • One Status display bound to di_overload (shows red when TRUE)
3. Configure the IO-field Mode to Input/output for the start/stop fields and Output for the read-only fields.
4. Add a second screen (e.g. Trend) using the Trend view object logging ai_pressure every 500 ms for 5 minutes.
5. Wire the F-keys: select the F1 button → Properties > Events > Press → add the action SetValue on tag cmd_start with value 1. Repeat for F2 with value 0.

7. Compiling, Downloading, and Commissioning

1. Compile the LOGO! 8 program: LOGO! 8 BM > Compile > Software (rebuild all blocks). Resolve any "Function block not supported by target" errors — these typically come from a LOGO! Soft Comfort version mismatch (e.g. an FB from LOGO! 8.3 used in a LOGO! 8.0 project).
2. Download to the LOGO! 8: select the LOGO! 8 device → Online > Download to device. The PG/PC interface should be S7ONLINE > Intel(R) Ethernet Connection I219-V — TCP/IP (or similar NIC). Confirm the target is shown as 192.168.0.1 in the dialog.
3. Compile the HMI: HMI_1 [KP300] > Compile > Software (rebuild all). Warnings about unused tags or screen numbers above 100 can be ignored on the KP300 (it supports 100 screens).
4. Download to the KP300: select the KP300 → Online > Download to device > Extended download to device (this lets you set the IP, transfer mode, and the HMI image in one go). Choose Transfer via Ethernet and enter the target IP 192.168.0.20. The KP300 will reboot into transfer mode automatically.
5. After the transfer the KP300 reboots and starts the runtime. The LOGO! 8 display should show no connection icon (no red X on the Ethernet symbol). If a red X is shown, see Section 9.

8. Verification

1. Connection state: on the LOGO! 8 front panel, navigate LOGO! > Diagnostics > Ethernet > Connections. There should be exactly one active connection showing the partner IP 192.168.0.20, port 102, type S7.
2. Live tag: in WinCC, start the simulation (HMI_1 > Online > Simulation > Start with tag simulator) before the actual KP300 is connected. Toggle a bit in the simulator; the corresponding output on the LOGO! 8 should change. If the simulator cannot read 192.168.0.1, the S7 connection has not been established — check the project tree for a missing HMI connection.
3. KP300 diagnostics: on the panel press the system keys (F9, F10) to open System > Information > Connection status. The connection should be "Connected".
4. End-to-end I/O check: force input I1 on the LOGO! 8 (or wire a pushbutton). The di_overload status display on the KP300 should toggle within one acquisition cycle (1 s by default).

9. Troubleshooting Matrix

10. Differences vs. the LOGO! TD

Engineers familiar with the LOGO! TD (Text Display) often assume the same four-function-key paradigm carries over to the KP300. The differences are summarized in the table below for reference.

11. Firmware and Migration Notes

The KP300 Basic mono PN was the first monochrome PN panel in the SIMATIC HMI Basic line and is now in "phase-out — service phase" per the Siemens product lifecycle. It is still fully supported for new installations but for new projects the recommended successor is the SIMATIC HMI KTP400 Basic (4-inch, color) with catalog number 6AV2 123-2DB03-0AX0. The configuration process is identical: same HMI connection type, same S7 protocol, same tag mapping, only the device in the hardware catalog is different.

For LOGO! 8.3 (0BA8 FS:05) and LOGO! 8.4 (0BA9) the procedure remains unchanged. The only practical differences are:

• LOGO! 8.4 exposes up to 38 digital inputs and 28 digital outputs, requiring a wider tag list.
• The variable memory expanded to 4 blocks (DB1, DB2, DB3, DB4) in 0BA9 — the HMI tag list may need to be re-pointed if migrating from 0BA8.
• PROFINET S2 redundancy is supported on 0BA9 — irrelevant for an HMI connection but worth noting if the LOGO! is later integrated into a PROFINET ring.

12. Field-Commissioning Checklist

1. LOGO! 8 BM powered, Ethernet LEDs (Link/Activity) lit on the port used.
2. KP300 powered, 24 V DC measured between pins 1 (+) and 2 (−) of the power connector, current draw < 0.4 A.
3. PG/PC interface in TIA Portal set to the correct NIC.
4. Ping from PC to 192.168.0.1 and to 192.168.0.20 both succeed.
5. LOGO! 8 project compiled and downloaded without warnings (except license / HSP notes).
6. HMI project compiled and downloaded via "Extended download to device".
7. HMI connection in project tree shows partner IP = LOGO! 8 IP, access point = S7ONLINE.
8. Live tag test: change an input on the LOGO! → KP300 status display reacts within 2 s.
9. F-key test: F1 on KP300 sets cmd_start = 1, LOGO! output Q1 latches on.
10. Save the project archive (.zap) on the engineering laptop and a copy on the company file server.

FAQ