FATEK FBs-4DA - 6.2 Structure and Wiring of 5 VDC Ultra High Speed Differential Input Circuit

H6-2
6.2 Structure and Wiring of 5VDC Ultra High Speed Differential Input Circuit
Only the MN main unit of FBs provides the 5VDC ultra high speed differential input circuit, which is mainly used for the
input of hardware high speed counter (HHSC) with a maximum working frequency up to 920 KHz. In practice, to ensure
the high speed and high noise immunity, please use Line-Driver for differential line driving. In environments with small
noise and medium working frequency (＜100KHz), however, it can be changed to the 5VDC single-end SINK or SRCE
input or to the 24VDC single-end SINK or SRCE input by connecting a 3KΩ/0.5W resistor in series, as shown in the
figure below.
(A) Wiring of 5VDC differential input for Line-Driver driving（with frequency up to 920KHz for high speed and
environments with large noise）
雙絞線
A
B
(編碼器)
FBS-PLC
(B) Wiring of 5VDC differential input to 5VDC single SINK or SRCE input (100KHz)
SRCE input
PNP
Sensor
NPN
Sensor
5V
DC
FBS-PLC
R2
R1
R1
R2
SINK input
(C)
Method of converting 5VDC differential input to 24VDC single-end SRCE input (frequency＜100KHz)
PNP
Sensor
SINK input
NPN
Sensor
24
VDC
FBS-PLC
3KΩ/0.5W
3K
Ω/0.5W
R2
R1
R1
R2
SRCE input
Twisted-pair
(Encoder)
External differential output
R1:100Ω
R2:1.2KΩ