Synrad FH FLYER - Page 155

technical reference
SYNRAD FH Series Flyer Operator’s Manual Version 3.4
125
–1.0 to +1.0 +3.0 to 24.0 6 9 16 23 20 29 32 47 1
to CPU
to CPU
IN0_A
IN0_B
IN1_HI
IN1_LO
IN2_LO
IN2_HI
IN3_A
IN4_A
IN5_A
IN6_A
IN7_A
IN3-7_B
Pin 20
Pin 8
Pin 9
Pin 21
Pin 22
Pin 10
Pin 23
Pin
11
Pin 24
Pin 12
Pin 25
Pin 13
50mA
750Ω, 2W
100mA
310Ω, 2W
309Ω, 1/8W
5.6V
1000pF
5.6V
1000pF
100mA
310Ω, 2W
309Ω, 1/8W
50mA
750Ω, 2W
50mA
750Ω, 2W
50mA
750Ω, 2W
50mA
750Ω, 2W
50mA
750Ω, 2W
Input eld wiring notes
 In electrically noisy environments, we recommend using shielded multi-conductor I/O cable as well as
a shielded backshell when connecting eld wiring to Flyer’s DB-25 User Interface connector.
 To minimize ground loop noise, ground the cable shield at the signal source only. The cable shield at
the User Interface connector must be left oating unless you are using Flyer’s +15 VDC auxiliary power
output as the I/O signal source.
Input/Output circuitry
Figure 6-3 illustrates an equivalent circuit diagram of FH Flyer’s optically-isolated input circuitry.
Figure 6-3
FH Flyer’s equivalent input circuit