BURKERT 20070084 (Type 8647 AirLINE SP) is an 8-station modular electropneumatic valve island designed for seamless mechanical and electrical docking to Siemens SIMATIC ET 200SP and SIMATIC ET 200SP HA distributed I/O systems. Fabricated in Revision 2 (REV.2) hardware architecture with an 11 mm grid per station, the unit integrates connection units, electronic base modules (PQ modules), pneumatic base modules, and high-response pilot solenoid valves into a singular DIN-rail assembly. Operating across an operating pressure range of 2.5 to 10 bar and a medium temperature range of 0 °C to +50 °C, article 20070084 features G 1/4 primary pressure supply connections and bottom-facing D6 push-in working connections.

System Architecture and Revision 2 Features

Type 8647 AirLINE SP Revision 2 incorporates optimized fluidic geometry and standardized pneumatic flange profiles across the valve deck. Revision 2 units are visually and mechanically differentiated by specific hardware indicators:

• Standardized Flange Profile: Single valves (Type 6524 3/2-way and Type 6525 5/2-way) and double valves (Type 6524 2x3/2-way) share the standardized FM20 flange interface towards the pneumatic base module.
• Working Connection Arrangement: The D6 push-in working connection channels are arranged in a wavy layout along the module base.
• Push-in Release Rings: Hose connectors are fitted with blue release rings (in contrast to the black rings used on REV.1).
• Nameplate Identification: Designated with explicit "Rev.2" notation on the identification label.
• Reduced Pressure Drop: When optional P-channel shut-off (Pneumatic HotSwap) valves are deployed, flow reduction is limited to 20% (compared to up to 50% on REV.1).

Flange Incompatibility

Single valves configured for REV.1 (flange pattern FM14/FM15) and REV.2 (flange pattern FM20/FM24) are mechanically incompatible. Replace REV.2 valve stations exclusively with REV.2 replacement valves.

Technical Data and Operating Parameters

Technical Property	Specification for Article 20070084
Valve Island Type	Type 8647 AirLINE SP (Revision 2)
Station Grid Width	11 mm
Valve Slot Count	8 stations
Valve Function Population	Mixed valve population (3/2-way and 5/2-way functions)
Operating Pressure Range	2.5 bar to 10.0 bar (gauge pressure)
Medium Temperature Range	0 °C to +50 °C
Ambient Temperature Range	0 °C to +55 °C
Operating Medium	Lubricated or non-lubricated dry compressed air, neutral gases (ISO 8573-1:2010, Class 7.4.4; 5 µm filtration recommended)
Flow Rate ($Q_{\text{Nn}}$ value air)	300 l/min (measured at +20 °C, 6 bar inlet pressure, 1 bar pressure drop)
Operating Voltage	24 V DC (±10%), max. residual ripple 2.4 Vss
Nominal Power per Solenoid	0.8 W (single valve) / 2 x 0.8 W with integrated power reduction (double valve)
Supply Port 1 (P) / Exhaust Ports 3 (R), 5 (S)	G 1/4 thread
Working Ports 2 (A), 4 (B)	Push-in coupling D6 (6 mm tube outer diameter)
Mounting Position	Any, preferably vertical with actuators upright
Ingress Protection Rating	IP20 (IP65 when housed inside an enclosed industrial control cabinet)
Control Cabinet Minimum Requirement	At least IP54 enclosure rating according to EN 60529

Modular Composition and Connection Units

Type 8647 valve assemblies consist of connection units (PSU modules) flanking the perimeter and modular valve units situated along the standard mounting rail.

Connection Units (PSU)

Connection units establish the pneumatic supply, auxiliary pilot control air, main exhaust deaeration, and mechanical clamping to the DIN rail:

• PSU-L (Left Connection Unit): Interfaces directly with the Siemens SIMATIC ET 200SP BaseUnit to the left. Features a green "PWR OK" LED indicating proper load voltage.
• PSU-R (Right Connection Unit): Terminates the pneumatic supply or allows dual-end feeding for extended island layouts.
• Intermediate Feed (PSU-M): Optional intermediate air supply units are inserted when island sizes exceed 24 valve functions (or 16 functions when using 2x3/2-way valves) to prevent pressure drops.

Valve Units

Valve units comprise three interlocking functional layers:

1. Electronic Base Module (PQ Module): Houses electrical terminal blocks, valve driver electronics, visual channel status LEDs, module DIAG LED, and an integrated graphics LCD for channel status and diagnostic readouts.
2. Pneumatic Base Module: Manages fluid routing, supply ducting, exhaust channels, and downward-facing D6 push-in tube ports.
3. Pilot Solenoid Valves: High-speed monostable or bistable valves (Type 6524, Type 6525, or Type 0460) secured with fastening screws onto the pneumatic base.

Pneumatic Installation and Port Layout

Pneumatic connections are divided into supply/exhaust connections on the connection units and working connections on the pneumatic base modules.

Port Identification	Marking / Connection	Port Function	Recommended Tightening Torque
Port 1	P / 1	Compressed air pressure supply (G 1/4)	4 to 7 Nm (max. 20 Nm)
Port 3 / 5	R / 3, S / 5	Exhaust air deaeration (G 1/4)	4 to 7 Nm (max. 20 Nm)
Port X	X	Auxiliary pilot air / pilot exhaust (M5)	1.0 to 1.2 Nm (max. 3 Nm)
Port 2	Service port 2 (A)	Working port, upper or lower connection (D6 push-in)	Push-in tube engagement
Port 4	Service port 4 (B)	Working port, lower connection (D6 push-in)	Push-in tube engagement

Port Assignment Precaution

Never interchange pressure supply port 1 (P) and exhaust ports 3/5 (R/S). Pilot control exhaust port X must remain unsealed at all times to avoid operational malfunction or backpressure buildup.

Recommended Handling for D6 Push-in Tube Connections

Push-in connections comply with DIN ISO 14743:2020. Observe the following mechanical recommendations during tube piping:

• Hose Sizing: Ensure outer diameter (OD) tolerances do not exceed ±0.08 mm for Polyamide (PA) or ±0.1 mm for Polyurethane (PU).
• Straight Cutting: Cut pneumatic tubing squarely at 90°. Angular cuts impair claw holding forces and compromise O-ring sealing.
• Tensile Holding Capacity: Minimum required tensile force for 6 mm tubing is 120 N for PA tubing and 100 N for PU tubing.
• Supporting Sleeves: For flexible PU tubing operating under elevated pressure or temperature fluctuations, insert support sleeves (ID 20099400) to maintain structural integrity.

Electrical Connection and Control Integration

Type 8647 automatically engages the backplane communication bus and power supply bus when latched to the adjacent Siemens SIMATIC ET 200SP BaseUnit:

• Load Voltage Supply: 24 V DC power for pilot valves is drawn via the L+ and M lines of the ET 200SP power bus. The AUX line is not utilized.
• Dedicated Supply Recommendation: Mount a light-colored Siemens BaseUnit (type code BU...D or BU...D/T) immediately to the left of the valve island to provide an independent potential group.
• Subsequent BaseUnits: Because the power bus terminates at the right interface of Type 8647, any SIMATIC ET 200SP modules installed to the right of the valve island must start with a light-colored BaseUnit (BU...D) to re-inject load voltage.

Safety-Related Shutdown Options

Three complementary methods allow immediate de-energization of the pilot valves independent of the master fieldbus controller:

1. SIA Channel Shutdown: Valves with an auxiliary wiring lead (free strands) can be individually de-energized via safety contacts with cable runs up to 2 m inside the enclosure.
2. EVS Module Shutdown: Electronic base modules marked "EVS" feature a 2-pole pluggable terminal (0.14–1.5 mm²) to disconnect the common valve supply across all 4 or 8 stations of that specific module via a potential-free contact.
3. Siemens F-PM-E Power Module: Operating Type 8647 in the load group of a Siemens F-PM-E 24VDC/8A PPM ST fail-safe power module provides SIL/PL-compliant safety shutdown across the entire island. For reliable operation with F-PM-E dark test pulses, parameterize readback time for dark and switch-off tests between 1.5 and 2.5 ms, and switch-on test readback time to 0.8 ms.

Diagnostics, LCD Display, and Commissioning

Each electronic base module incorporates two LED indicators (DIAG and PWR) along with an LCD screen displaying channel switching states, valve cycle counts, and real-time operational messages:

• Channel Status: Numbers 0 through 7 indicate active energized outputs. Feedback arrows display actuator end positions (A for upper position, B for lower position) when configured.
• Diagnostic Messages: The display scrolls diagnostic alarms including Wire Break Ch. x, Short Circuit Ch. x, EVS active, No supply voltage, and Pilot SCC Limit Ch. x (switching cycle counter warning limit reached).
• Switching Cycle Monitoring: Independent 32-bit counters record actuations for both the pilot valve and the field actuator per channel, enabling targeted preventive maintenance.