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System 9000 Backplane; 7908; PR Electronics;

System 9000 Backplane

Techno Supply  »  Products  »  PR Electronics  »  System 9000 Backplane
System 9000 Backplane
System 9000 Backplane
Key features

Provides safe, easy wiring between the backplane and non I.S. automation systems using standard prefabricated I/O cables
Direct, Redundant and Duplicate signalling - including HART I/O
Robust, compact high-end design solution for 8 system 9000 units
Digital output and LEDs indicate backplane system status


The 7908 backplane is a compact and robust solution that enables a safe and easy connection of PR system 9000 IS device signals into standard automation systems.

Standard automation system cables and connectors are used to link the backplane to the I/O cards.

The backplane can be used for Direct, Redundant, Duplicate signalling including HART I/O System connectivity (HART MUX).

The system 9000 devices isolate and convert AI, AO, DI and DO signals coming from, or going to the I.S. classified area, and routes those signals to a system automation I/O card.

The system 9000 units maintain a SIL2 level of functional safety, even when mounted in the backplane solution.

Flexible horizontal/vertical panel or wall mounting in the Safe or Zone 2 / Div 2 areas.

System 9000 devices easily snap ON and OFF using piano keys, and devices can be hot-swapped.

Tag number and ID labels are easily mounted and read by using the dedicated piano key spacer.

Wide temperature operation range: -20...+60°C.

Backplane selection guide can be found at


Robust, compact high-end design that holds 8 system 9000 units.

Digital output indicates status of the 9000 devices and primary/back-up power supplies.

Flexible 24 VDC supply voltage and redundant power supply connection solution.


Environmental Conditions

Specifications range -20°C to +60°C

Storage temperature -40°C to +85°C

Relative humidity < 95% RH (non-cond.)

Installation in Pollution degree 2 & measurement / overvoltage cat. II


Mechanical specifications

Dimensions (HxWxD) 144 x 247 x 141 mm

Wire size 2.5 mm2 / AWG 12 (Supply 1 / 2 and status relay connectors)



Supply voltage 20...31.2 VDC (24 DC nom.)


Isolation voltage

Isolation voltage, test / working 500 VAC / 50 VAC (Basic isolation between supply 1 & 2 and status relay)

Max. power consumption ≤ 30 W

Replaceable fuses Fuse F1 & F2: 1.6 A SB, 250 V, type TR5


Output specifications

Status relay

Max. voltage 32 V (Zone 2 / Div. 2 area) 42 V (Safe area)

Max. current 100 mA (Zone 2 / Div. 2 area) 100 mA (Safe area)



EMC 2004/108/EC

UL UL 508

EAC TR-CU 020/2011


IECEx DEK 13.0044X

FM 0003049918-C 

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19. 3403 2300
Av. Santo Estevão, 509
Vila Rezende - 13405-249

Piracicaba, SP - Brazil
Techno Supply Import and Export Ltda.
CNPJ 05.505.756/0001-06