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3. SIGNALS AND WIRING
(b) Open collector system
1) Interface
Approx. 1.2k
Servo amplifier
24VDC
OPC
PP, NP
DOCOM
SD
Max. input pulse
frequency 200kpps
2m or less
(Note)
Note. Pulse train input interface is comprised of a photo coupler.
Therefore, it may be any malfunctions since the current is reduced when connect a
resistance to a pulse train signal line.
If the command pulse train input is open collector method, it supports only to the sink
(NPN) type interface.
It does not correspond to the source (PNP) type interface.
2) Input pulse condition
0.9
0.1
tc
tHL
tc
tLH
tF
tLH=tHL<0.2 s
tc>2 s
tF>3 s
PP
NP
Driver