Integrating PCS 7 Industry Library (IL) Alarms with SIMATIC Comfort Panels in TIA Portal

To display PCS 7 process alarms on a SIMATIC Comfort Panel programmed in TIA Portal using the PCS 7 Industry Library (IL), engineers must utilize the Industry Library's companion panel blocks (such as PMotL, PMonAnL) and configure discrete bit alarms in TIA Portal. S7-400 controllers generate alarms via Alarm_8P telegrams, which SIMATIC Comfort Panels cannot natively decode over standard S7 communication. The Industry Library resolves this by extracting alarm states inside companion blocks and publishing them into structured status DWORDs (AlmState / ActState). In TIA Portal, engineers must import the pre-configured IL alarm text lists, bind HMI discrete alarms to these status tags, and establish cyclic S7 communication with the AS controller.

Architectural Incompatibility Between Alarm_8P and Comfort Panels

In enterprise PCS 7 architectures, operator interaction is traditionally centered on WinCC Operator Stations (OS Servers and OS Clients). However, in modern hybrid plants, field-level visualization on local touchscreen panels (such as SIMATIC Comfort Panels TP700, TP1200, TP1900) is frequently required for skid control and package units.

Engineers attempting to integrate Comfort Panels via TIA Portal WinCC Comfort encounter a fundamental protocol mismatch:

Alarm Processing LayerSIMATIC PCS 7 OS (WinCC SCADA)SIMATIC Comfort Panel (TIA Portal WinCC)Primary Alarm MechanismNative Alarm_8P / AR_SEND event telegramsDiscrete Bit Alarms / Analog Threshold AlarmsS7 Communication ProtocolEvent-driven S7 messaging (P_SND_RK / raw buffers)Cyclic polling of Data Block variables (HMI Tags)Timestamp AuthorityAS controller real-time clock (1 ms to 10 ms SoE)HMI panel local time or polled timestamp tagAPL Faceplate SupportNative WinCC OCX FaceplatesIncompatible (Requires Industry Library Panel Blocks)

Because Comfort Panels cannot unpack asynchronous Alarm_8P frames from an S7-400 CPU, alarms must be converted into standard polled bit registers.

Industry Library Dual-Block Concept (APL Block to Panel Block)

To bridge the gap between PCS 7 APL and TIA Portal operator panels, Siemens engineered the SIMATIC PCS 7 Industry Library (IL). The Industry Library deploys a dual-block architecture:

Technological Master Block (APL): Runs the core control algorithm (e.g., MotL FB1850 or PIDConL FB1874) in the S7-400 AS. It handles interlocks, channel drivers, and high-level WinCC OS alarms via Alarm_8P.
Companion Panel Block (IL): Placed in the same CFC chart (e.g., PMotL FB1140 or PPIDConL FB1144). It interconnects directly to the APL block.

The panel block maps complex APL statuses—such as motor running, feedback error, interlock trip, and alarm states—into compact 32-bit status words (ActState, AlmState). The Comfort Panel in TIA Portal cyclically reads these tags, displaying pre-configured Comfort faceplates and firing discrete bit alarms.

Step-by-Step Configuration Workflow in PCS 7 and TIA Portal

To configure seamless alarm visualization on a Comfort Panel using the Industry Library, execute the following technical workflow:

Instantiate Panel Block in CFC: In the PCS 7 CFC chart containing MotL, insert companion block PMotL from the PCS 7 Industry Library. Execute the standard interconnection macro (connecting MotL.Status1..Status4 to PMotL.Status1..Status4).
Compile CFC and Identify Address: Compile the CFC chart. In SIMATIC Manager, inspect the generated instance Data Block for PMotL (e.g. DB 1050). Note the byte offset for parameter AlmState.
Configure S7 Connection in TIA Portal: In TIA Portal, open the Comfort Panel project. Under Devices & Networks -> Connections, configure an S7 Connection pointing to the S7-400 AS CPU IP address and rack/slot (typically Rack 0, Slot 3 or 4).
Import IL Faceplates and Text Lists: In TIA Portal, open the Global Library pane. Open the PCS 7 Industry Library for TIA Portal. Drag the pre-configured PMotL faceplates, screen popups, and Alarm Text Lists into your project tree.
Configure Discrete Alarms in TIA Portal: Open HMI Alarms -> Discrete Alarms. Create alarm lines mapped to the bits of PMotL.AlmState:
- Bit 0: Motor Protection Trip
- Bit 1: Feedback Monitoring Error
- Bit 2: Interlock Active
Assign message texts from the imported IL Text Library.
Download and Test: Download the compiled TIA Portal project to the Comfort Panel.

Verification

Confirm that Comfort Panel alarm integration operates reliably through these diagnostic procedures:

HMI Tag Communication Verification: On the Comfort Panel, open the PMotL faceplate. Verify that motor status (Stop, Running, Manual, Auto) reflects live AS states with green connection status.
Simulate Drive Fault: In CFC Test Mode, induce a motor trip (MotL.Trip = 1).
Comfort Panel Alarm Display: Confirm that the Comfort Panel's top alarm banner displays the discrete alarm:
[Tag: PUMP_01] Motor Protection Trip
Simultaneous WinCC OS Alarm: Verify that the central WinCC OS Server simultaneously logs the standard Alarm_8P message, confirming dual-tier visualization.

Limitations and Operational Precautions

When integrating TIA Portal panels into PCS 7 via Industry Library, observe these technical boundaries:

Licensing Requirements: Operating Industry Library blocks in the AS requires the SIMATIC PCS 7 Industry Library AS License. Operating IL faceplates on Comfort Panels requires the PCS 7 Industry Library for Panels License in ALM.
S7 Connection Limits: S7-400 CPUs have fixed communication connection quotas. Adding multiple Comfort Panels consumes active S7 connection resources on the CPU or CP 443-1.
Commercial Accuracy Notice: Industry Library packages (e.g., 6ES7658-5AX58-0YA5 for IL Engineering) are licensed option packages. Always verify order numbers and software maintenance contracts with an authorized Siemens distributor.

Engineer FAQ

Can I use TIA Portal Device Proxy instead of a direct IP connection?

Yes. Exporting the device proxy data (.S7P) from SIMATIC Manager allows TIA Portal to automatically browse DB tags and symbols, simplifying HMI tag binding.

Why can Comfort Panels not receive Alarm_8P telegrams directly?

Alarm_8P relies on proprietary AS-OS event services implemented in WinCC SCADA. TIA Portal WinCC Comfort panels utilize a lightweight operating system runtime (Windows CE / Linux) that only supports polled discrete bit alarms.