BURKERT 20045660 (Type 8647 AirLINE SP) is a modular electropneumatic valve island configured as an 11 mm station width, 12-slot Revision 2 (REV2) assembly for direct backplane integration into Siemens SIMATIC ET 200SP and ET 200SP HA distributed I/O systems. Specifically built for high-density control cabinet installations, article 20045660 incorporates an integrated electronic pressure sensor on its pneumatic supply connection unit, G 1/4 process connection ports for supply and exhaust, and bottom-facing D6 push-in working connectors.

Type 8647 eliminates intermediate wiring by mechanically and electrically docking directly alongside Siemens peripheral modules on a standard rail. Actuator control signals, diagnostic messages, channel switching states, and measured supply pressures exchange directly over the backplane bus. In field deployment, pneumatic outputs drive single-acting or double-acting process valves, hygienic diaphragm valves, and linear actuators with immediate diagnostic visibility on both local LC displays and the central engineering environment.

Revision 2 (REV.2) Design Features

Article 20045660 represents the Revision 2 (REV.2) generation of Type 8647. The REV.2 platform standardizes mechanical interfaces across pneumatic components, optimizes air channel geometry, and introduces visual identifiers to prevent component mismatches during installation and servicing.

Feature	Generation REV.1	Generation REV.2 (Article 20045660)
Push-in Connector Release Rings	Black release rings	Blue release rings
Working Connection Arrangement	Parallel channel spacing	Wavy channel arrangement
Type Label Designation	Standard type code without "Rev." marking	Explicit "Rev.2" printed on type label
Single Valve Flange Interface	FM14 flange profile	Standardized FM20 flange profile
Flow Reduction with Integrated P Shut-Off	Up to 50% flow reduction	Flow reduction limited to approximately 20%

Flange Profile Incompatibility

Single pilot valves from REV.1 (FM14 profile) and REV.2 (FM20 profile) have incompatible mechanical mounting interfaces. When replacing single pilot valves on article 20045660, select only REV.2 replacement valves equipped with FM20 flange seating.

Modular System Architecture

The 12-slot valve block consists of two primary functional sections: connection units (PSU modules) and valve units (PQ electronic modules assembled to matching pneumatic base modules).

Connection Units (PSU Modules)

Connection units handle centralized compressed air supply and system deaeration while locking the assembly mechanically to the DIN standard rail. Article 20045660 includes 1 electronic pressure sensor module integrated into the supply section, with zero intermediate feed units required for this 12-slot length.

• Supply and Exhaust Ports: G 1/4 female threads for port 1 (P supply) and ports 3/5 (R/S exhaust).
• Auxiliary Control / Pilot Exhaust: M5 port (X) for external auxiliary pilot air or pilot valve exhaust venting.
• Integrated Pressure Measurement: Relative pressure sensing from 0 bar to 10 bar with high-speed digital feedback over the backplane bus.

Valve Units (PQ Electronic and Base Modules)

The 12 valve stations are configured using 4-slot or 8-slot base modules. Each valve slot features an 11 mm width per station.

• Electronic Base Modules (PQ Modules): House valve actuation electronics, status LEDs, LC graphic displays, and electrical plug connectors.
• Pneumatic Base Modules: Form the pneumatic channel manifold, support the pilot valves, and terminate downward into D6 push-in couplings.
• Integrated LC Displays: Provide direct textual readouts of channel statuses, valve switching cycles, maintenance reminders, and measured air pressures.

Technical Specifications

Parameter Group	Specification Value
Valve Island Article Number	20045660
Device Model & Type	Type 8647 AirLINE SP
Valve Slot Capacity	12 stations (11 mm pitch)
Operating Pressure Range	2.5 bar to 10 bar (relative)
Fluid Medium	Dry, filtered compressed air (oiled or unoiled), neutral gases
Compressed Air Quality	ISO 8573-1:2010, Class 7.4.4 (5 µm filtration recommended)
Medium Temperature	0 °C to +50 °C
Ambient Operating Temperature	0 °C to +55 °C
Air Flow Rate (QNn)	300 l/min (Type 6524 / 6525); 200 l/min (Type 0460)
Electrical Supply Voltage	24 V DC (±10%), max. residual ripple 2.4 Vss
Nominal Power per Valve	0.8 W (single valve); 2 × 0.8 W with power reduction (double valve)
Electrical Protection Class	Class III according to DIN EN 61140, VDE 0140
Ingress Protection Rating	IP20; IP65 inside closed control cabinets
Housing Materials	Polyamide (PA) and Polycarbonate (PC)
Seal Materials	NBR, FKM, and PUR

Integrated Pressure Sensor Specifications

Article 20045660 includes an integrated digital pressure sensor located in the connection unit to provide continuous continuous supply pressure monitoring without external transmitter hardware.

• Pressure Measurement Range: 0.0 bar to 10.0 bar (relative to ambient atmospheric pressure).
• Burst / Overpressure Resistance: 14.0 bar maximum (exceeding 14 bar causes permanent calibration loss).
• Sensor Accuracy: 0.2 bar across the nominal measuring span.
• Sampling Rate: > 10 measurements per second with internal median filtering.
• Process Data Representation: 4-byte cyclic input data providing raw analog value (0 to 27648 decimal = 0 to 10 bar), warning and error threshold flags, and Quality Information (QI) bit.

Pressure [bar]	Pressure [psi]	Raw Value (Decimal)	Raw Value (Hexadecimal)	QI Bit Status
> 10.0 bar	> 145 psi	0	0x0000	0 (Invalid)
10.0 bar	145 psi	27648	0x6C00	1 (Valid)
7.5 bar	109 psi	20736	0x5100	1 (Valid)
1.0 bar	14.5 psi	2765	0x0ACD	1 (Valid)
0.0 bar	0.0 psi	0	0x0000	1 (Valid)
< 0.0 bar	< 0.0 psi	0	0x0000	0 (Invalid)

Pilot Valve Integration and Circuit Functions

The 12 valve slots on 20045660 accommodate monostable flipper valves (Type 6524 and 6525) and slide valves (Type 0460). Each slot is equipped with manual override mechanisms as standard.

• Circuit Function C (CF C): 3/2-way or 2× 3/2-way pilot valve, servo-assisted, normally closed, rated QNn 300 l/min.
• Circuit Function D (CF D): 3/2-way pilot valve, servo-assisted, normally open, rated QNn 300 l/min.
• Circuit Function H (CF H): 5/2-way pilot valve, servo-assisted, port 1 pressurized to port 2 or 4, rated QNn 300 l/min.
• Circuit Function L / N / Z: 5/3-way and 5/2-way impulse valves (Type 0460), rated QNn 200 l/min.

Unused Slot Protection

If any of the 12 stations remain unoccupied, install mechanical cover plate 661092 (REV.2) over the pneumatic port and fit electrical connection blanking plug 653670 on the electronic base module to maintain system sealing.

Control Automation and Network Configuration

Type 8647 connects to the centralized plant PLC through the SIMATIC ET 200SP or ET 200SP HA interface modules (IM 155-6 PN or IM 155-6 DP).

• Engineering File Support: Device integration via standard GSDML (PROFINET IO) or GSD (PROFIBUS DP) files.
• Direct Software Integration: Configurable in Siemens STEP 7 Classic via Hardware Support Package HSP2105, Siemens TIA Portal via HSP0225, and Siemens PCS7 via Hardware Update Package (HUP).
• Switching Cycle Counters: Independent remanent counters track operating cycles for each pilot valve and each actuated field device up to maintenance limits.
• Safety Shutdown Capabilities: Compatible with Siemens F-PM-E 24VDC/8A fail-safe power modules for group safety trips, optional SIA single-channel shut-off, and EVS potential-free module shutdown.

Installation and Pneumatic Connection Guidelines

Mounting must comply with DIN standard rail tolerances inside an industrial enclosure providing at least IP54 ingress protection.

• Mounting Clearance: Maintain a minimum overhead clearance of 50 mm above the top edge of the valve block for airflow and module latching (minimum 80 mm if external EVS terminals are wired).
• DIN Rail Fastening: Torque mounting screws to approximately 1.8 Nm clockwise.
• Port Tightening Torques: Torque G 1/4 supply and exhaust ports to 4–7 Nm (maximum allowable 20 Nm). Torque M5 auxiliary ports to 1.0–1.2 Nm (maximum 3.0 Nm).
• Pneumatic Tubing Insertion: Cut D6 polyamide (PA) or polyurethane (PU) tubing square without beveling. Observe ISO 14743 minimum tensile holding requirements (120 N for D6 PA tubing; 100 N for D6 PU tubing). Use internal support sleeves (ID 20099400) when operating with flexible PU hoses under demanding pressure conditions.