7908
System 9000 backplane
- 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
Application
- 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/SIL3 level of functional safety, even when mounted in the backplane solution.
Technical characteristics
- 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.
Mounting / installation / programming
- 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 www.prelectronics.com/backplane
Backplane selection guide
Environmental Conditions
| Operating temperature | -20°C to +60°C |
| Storage temperature | -40°C to +85°C |
| Relative humidity | < 95% RH (non-cond.) |
| Installation in | Pollution degree 2 & meas. / 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) |
Common specifications
Supply |
|
| Supply voltage | 20...31.2 VDC (24 DC nom.) |
| Max. required power | ≤ 30 W |
Isolation voltage |
|
| Isolation voltage, test / working |
500 VAC / 50 VAC
(Basic isolation between supply 1 & 2 and status relay) |
| 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) |
Observed authority requirements
| EMC | 2014/30/EU |
| EAC | TR-CU 020/2011 |
Approvals
| UL | UL 508 / C22.2 no. 14 |
| ATEX | DEKRA 13ATEX0136X |
| IECEx | DEK 13.0044X |
| FM | 0003049918-C |