HTS KS – Fieldbus PFA 700 / PFA 710 with Module Subrack BGT

Overview

The Fieldbus Interface PFA 700 and PFA 710 are 19″ plug-in modules designed to integrate Honeywell Kromschröder PFU burner control units into industrial communication networks using PROFIBUS DP. Mounted in the pre-wired module subrack BGT, the PFA transmits activation signals and feedback data between burner controls and the plant PLC, enabling centralized monitoring, control, and remote diagnostics over a single standardized fieldbus cable.

The PFA 700 integrates up to nine PFU 760 burner control units for directly ignited burners, while the PFA 710 integrates up to eight PFU 780 control units for pilot and main burner applications. The BGT module subrack provides a backplane with screw terminals for reliable wiring, and the system supports bus baud rates up to 1,500 kbit/s. The PROFIBUS DP bus interface remains active even when the PFA is switched to standby mode, maintaining network communication continuity.

Features & Benefits

• 19″ plug-in module format — mounts directly in BGT module subrack alongside PFU burner control units for a compact, organized installation
• PROFIBUS DP communication — standardized fieldbus reduces development, installation, and commissioning costs compared to conventional point-to-point wiring
• Bus interface remains active in standby mode — maintains network communication even when the PFA mains switch is off
• Industrial plug connector system — allows unit exchange during bus operation without disrupting the communication network
• Remote maintenance and diagnostics — program status and fault codes displayed on integral 7-segment display; extended access via BCSoft software over optical interface
• Safety-related signals transferred independently — safety interlock and digital input signals carried via separate cables, independent of bus communication
• Password-protected parameterization — prevents unauthorized changes to parameter settings; factory default password 1234
• Manual operation mode — available for burner adjustment or fault-finding; time-limited to 5 minutes by default, deactivatable for emergency operation
• Up to 126 stations on a single PROFIBUS DP network — each station individually addressable via code switches on the PFA board

Technical Specifications

• Form factor: 19″ module — 8 depth units (40.6 mm) wide, 3 height units (128.4 mm) tall
• Mains voltage: 220/240 V AC or 110/120 V AC, -15/+10%, 50/60 Hz; suitable for grounded and ungrounded mains
• Ambient temperature: -20°C to +60°C
• Digital inputs: 4 × 24 V DC, ±10%, <10 mA
• Digital outputs: 4 × 24 V DC, max. 250 mW (100 mA) — for controlling small relays
• PFA weight: approx. 0.75 kg
• Fieldbus protocol: PROFIBUS DP (EN 50170 Vol. 2)
• Baud rate: up to 1,500 kbit/s
• Max. segment range: 1,200 m at 93.75 kbit/s; 200 m at 1,500 kbit/s (bus cable type A)
• Max. stations per segment: 32 (masters or slaves); expandable with repeaters (max. 3 in series)
• Max. network stations: 126 (masters and slaves combined)
• PROFIBUS addressing: 0–126, set via dual code switches on PFA board
• PFA 700 bus data: 5 input bytes (PFA to master), 3 output bytes (master to PFA)
• PFA 710 bus data: 5 input bytes (PFA to master), 5 output bytes (master to PFA)
• BGT module subrack dimensions: 483 mm W × 200 mm D × 132 mm H; weight 2.3 kg
• Enclosure requirement for installation: IP 54 or higher; no condensation permitted
• Certification: EC type-tested and certified to Low Voltage Directive 2006/95/EC and EMC Directive 2004/108/EC; Gosstandart approval for Russia

Applications

• Industrial furnace and kiln burner management — iron and steel, glass and ceramics, plastics and chemical industries
• Bogie hearth forging furnaces and walking beam furnaces in the metallurgical industry
• Intermittent shuttle kilns and continuous tunnel kilns in the ceramics industry
• Multi-burner systems requiring centralized PLC monitoring and control over PROFIBUS DP
• Staged On/Off and High/Low burner control with PFU 760 and PFU 760L
• Stage-controlled main burner systems with alternating or permanent pilot burner using PFU 780
• Retrofit and replacement of conventional multi-wire point-to-point wiring with standardized fieldbus architecture

Models / Configurations

• PFA 700T – Fieldbus interface for up to nine PFU 760 (directly ignited) burner control units; 220/240 V AC mains voltage
• PFA 700N – Fieldbus interface for up to nine PFU 760 burner control units; 110/120 V AC mains voltage
• PFA 710T – Fieldbus interface for up to eight PFU 780 (pilot and main burner) control units; 220/240 V AC mains voltage
• PFA 710N – Fieldbus interface for up to eight PFU 780 control units; 110/120 V AC mains voltage
• BGT SA-9U/1DP700 – 19″ module subrack; 9 PFU slots + 1 PFA 700 slot; PROFIBUS DP backplane (Order No. 84402291)
• BGT SA-8U/1DP710 – 19″ module subrack; 8 PFU slots + 1 PFA 710 slot; PROFIBUS DP backplane (Order No. 84402292)

PFA 700 / PFA 710 Accessories

• PROFIBUS Plug Connector (Order No. 74960621) – Replacement PROFIBUS plug connector with internal EMC shielding capacitor; required when installing new PFA 700 in older BGT module subracks (Order No. 8 440 228 3)
• GSD Device Master Data File CD (Order No. 74960460) – CD containing PROFIBUS DP device master data (GSD) files for PFA system configuration; also available at docuthek.kromschroeder.com
• Opto-Adapter with BCSoft CD-ROM (Order No. 74960437) – Optical interface adapter and BCSoft Windows software for extended parameter access, process visualization, and statistics; current software available via docuthek.kromschroeder.com
• “Changed Parameters” Stickers (Order No. 74921492) – Pack of 100 adhesive labels in DE/EN/FR; affix to PFA unit when factory default parameters have been modified

Documentation