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3. SIGNALS AND WIRING
(c) Pulse train input interface DI-2
Give a pulse train signal in an open collector or differential line driver system.
1) Open collector system
OPC
SD
24VDC
Interface unit
Max. input pulse
frequency 200kpps
Approx.
1.2k
PP , NP
2m(78.74in)
or less
tLH tHL 0.2 s
tc 2 s
tF 3 s
0.9
0.1
tc
tHL
tc tLH
tF
PP
NP
2) Differential line driver system
SD
Max. input pulse
frequency 500kpps
Interface unit
A
m26LS31 or equivalent
About 100
10m (393.70in) or less
PG
(NG
)
PP (NP )
tLH tHL 0.1 s
tc 0.7 s
tF 3 s
0.9
0.1
tc
tHL
tc tLH
tF
PP PG
NP NG