Deploying a SIMATIC Field PG as a Roaming Engineering Station Across Distributed PCS 7 Plant Areas

In multi-area SIMATIC PCS 7 distributed facilities (e.g., four geographically separated plant sections spaced 400 to 500 meters apart), deploying a single mobile SIMATIC Field PG (e.g., Field PG M5 or M6) to serve as a roaming Engineering Station (ES) across all areas is an officially supported, cost-effective architecture. Rather than procuring duplicate stationary ES hardware and redundant engineering licenses for each area, a single Field PG hosting the central Multiproject can connect to local plant network access points. By establishing an Industrial Ethernet fiber-optic backbone or secure industrial wireless bridge (SCALANCE W), the Field PG can engineer, monitor, and download to any AS controller or OS Server across all four plant sections seamlessly.

Architectural Analysis: Roaming Field PG vs Distributed Stationary ES

In industrial automation plants divided into distinct physical zones (e.g., Raw Materials, Processing, Utilities, Packaging) separated by distances of 400 to 500 meters:
- A traditional stationary ES model deploys an IPC in each area. This results in 4 separate Engineering Station licenses, high capital hardware costs, and severe version-control fragmentation when projects diverge.
- The Roaming Field PG Model: A single ruggedized industrial laptop (SIMATIC Field PG) hosts the master PCS 7 Multiproject.
- The engineer connects the Field PG to the network locally at any MCC/control cabinet, or connects remotely from an engineering office across the plant network.
- Dedicated stationary OS Single Stations or OS Clients remain in each plant section to provide continuous local operator control, while the Field PG handles all engineering downloads and commissioning.

Hardware Specifications: Selecting a Field PG for PCS 7

When procuring a Field PG for SIMATIC PCS 7 v8.x / v9.x:
- Recommended Hardware: SIMATIC Field PG M5 or M6 (Advanced Model):
- Processor: Intel Core i7 (high clock frequency for fast CFC compilation).
- RAM: Minimum 16 GB (32 GB strongly recommended for virtual machines and large multiprojects).
- Storage: High-speed NVMe Solid-State Drive (minimum 512 GB).
- Network Interfaces: Dual Gigabit Industrial Ethernet Ports (crucial for separating Plant Bus from Terminal Bus / Corporate Network).
- Integrated Field Interfaces: MPI / PROFIBUS DP interface (CP 5711 integrated) for direct controller diagnostics.

Network Infrastructure for Multi-Area Connectivity (400-500m)

Bridging 400 to 500 meters exceeds the 100-meter physical distance limit of standard copper CAT6 Industrial Ethernet:
1. Fiber-Optic Backbone (Recommended):
- Deploy managed industrial switches (e.g., SCALANCE X-300 / X-200 with optical SFP transceivers).
- Interconnect the 4 plant areas via multimode (up to 3 km) or single-mode (up to 26 km) fiber-optic cables.
- Install local RJ45 service outlets (wall receptacles or cabinet patch panels) in each area for Field PG plug-in.
2. Industrial Wireless LAN (IWLAN):
- Where trenching fiber is impossible, deploy SCALANCE W788 access points and directional antennas bridging the 500-meter spans.
- Protect wireless engineering traffic via WPA2-Enterprise and VPN encryption.

Licensing Strategy for Mobile Engineering Stations

The roaming Field PG strategy yields substantial commercial savings:

[!IMPORTANT]
When procuring Field PG packages and PCS 7 engineering licenses, always validate final license quantities and MLFBs against the applicable Siemens catalog and authorized distributor quotation.

Floating Engineering Licenses: Procure a single SIMATIC PCS 7 Engineering Station License (6ES7658-5...) installed on the Field PG via Automation License Manager (ALM).
Local Stations: Each plant section requires only standard OS Single Station or OS Client Runtime licenses, eliminating redundant ES license purchases.

Comparative Architecture Matrix: Engineering Deployment Models

The table below compares engineering deployment strategies:

Deployment ModelHardware Capital CostLicense CostVersion Control RiskMobility4x Stationary ES WorkstationsHigh (4x IPCs)High (4x ES Licenses)High (Projects diverge)Zero1x Roaming Field PG (Direct Plug)Low (1x Field PG)Lowest (1x ES License)Zero (Single Master Project)100% MobileCentral ES + Thin Clients (RDP)Moderate (1x Server)Moderate (RDP CALs)LowRequires strong network

Step-by-Step Procedure: Configuring a Roaming Field PG for PCS 7

Follow this procedure to commission the Field PG:

Step 1: Network Configuration on Field PG

In Windows Network Connections, configure the primary Ethernet port with a static IP address within the Plant Bus subnet (e.g., 192.168.1.200).
Configure the secondary Ethernet port for the Terminal Bus (e.g., 192.168.2.200).

Step 2: Configure Station Configuration Editor and PG/PC Interface

In SIMATIC Manager, ensure the ES PC Station contains an IE General network module matching the Field PG's active NIC.
Open Windows Control Panel > Set PG/PC Interface.
Set S7ONLINE to PC internal.local.1 (or TCP/IP -> [Field PG Network Adapter]).

Step 3: Establish Master Project Architecture

Store the master PCS 7 Multiproject directly on the Field PG's internal SSD (e.g., D:\PCS7_Projects\Plant_Master_MP).
If connecting locally in Area 3, plug the CAT6 cable into the local SCALANCE switch port.
Open SIMATIC Manager; connect online to Area 3 controllers; execute required changes and downloads directly.

Verification

To confirm that the Field PG functions reliably across all plant areas:
1. Network Connectivity Audit: Plug the Field PG into each area's service port sequentially; execute continuous pings to all four AS controllers; verify 0% packet loss.
2. Accessible Nodes Verification: In SIMATIC Manager, select PLC > Display Accessible Nodes; verify that local and remote AS controllers appear in the node list.
3. CFC Test Mode and Download: Open a CFC chart in Area 2; switch to online test mode; confirm that dynamic live values update without communication latency.

Limitations and Operational Precautions

Engineering teams must observe the following precautions:
- The Field PG contains the sole active master copy of the plant automation project; establish mandatory daily backup routines to an external server or corporate repository.
- Never unplug the Field PG network cable while an active online CPU download is in progress to prevent controller desynchronization.
- Ensure the Field PG battery is fully charged and the AC power adapter is securely connected during controller downloads.

Engineer FAQ

Can a Field PG run WinCC OS simulation on site?

Yes. SIMATIC Field PGs equipped with adequate RAM (16 GB+) and Core i7 processors have sufficient computing power to execute full WinCC OS runtime simulation alongside S7-PLCSIM.

What should I do if the plant bus uses optical fiber rings?

Connect the Field PG to a copper RJ45 port on a local SCALANCE X switch participating in the optical ring; the switch bridges copper Ethernet to the optical ring automatically.

Does the Field PG need to be running continuously for the plant to operate?

No. S7-400 controllers and WinCC OS operator stations execute autonomously 24/7; the Field PG is connected strictly when performing engineering modifications or diagnostics.

Technical References

Related Tags

Field PG
Engineering Station
Industrial Ethernet
SCALANCE
Multiproject

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Deploying a SIMATIC Field PG as a Roaming Engineering Station Across Distributed PCS 7 Plant Areas