Siemens SIMATIC NET PROFIBUS manual Technical Specifications

Technical Specifications 7

Table 7-1 Technical Specifications

Technical Specifications

Power supply (safety extra–low voltage with reliable isolation, SELV or complying with NEC Class 2)

Power consumption at 24 V input

Transmission rate

Transmission rate setting

Mode

Bit error rate

Input channel 1 to channel 3

Bit length

Jitter

Output channel 1 to 3

Bit length

Jitter

24 VDC (18 V to 32 V)

max. 200 mA

12 Mbps, 6 Mbps, 3 Mbps, 1.5 Mbps, 500 Kbps, 187.5 Kbps , 93.75 Kbps, 45.45 Kbps, 19.2 Kbps, 9.6 Kbps

made automatically

optical bus

<10–9

0.7 to 1.3 tBit

-0.03 to +0.03 tBit

0.99 to 1.01 tBit

-0.003 to +0.003 tBit

Signal delay time (any input/output)	≤ 6 tBit
Cascading depth of optical bus	limited only by signal run time
Electrical channel
Input/output signal	RS–485 level
Input dielectric strength	-7 V to +12 V
Minimum current at 5V (for terminating resistors)	10 mA
Electrical isolation from 24V input	Isolation due to function; not safety–related!
Optical channels
Optical source	LED
Coupled optical power	PT(min)	PT(max)
– in plastic fiber 980/1000	– 5.9 dBm	+0.5 dBm
– in PCF fiber 200/230	– 16 dBm	–1.5 dBm
Receiver sensitivity	PR(min)	PR(max)
– with plastic fiber 980/1000	–20 dBm	0 dBm
– with PCF fiber 200/230	–22 dBm	–2 dBm

PROFIBUS Optical Bus Terminal (OBT)	7-1
C79000-G8976-C122-02