Magnescale MJ100, Manual

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(E)
5
3-2. Resolution and output phase diff erence
Th e MJ100/110 outputs A/B phase signals, an alarm signal, and reference point signals as shown in Fig. 3-2.
Minimum phase difference: Tw: (MJ100: 100 ns, MJ110: 1 μs)
Tw +N
×
50 ns
Tw Tw Tw Tw
N: Fluctuation due to travel speed
Travel direction
reversal
High impedance
(Voltage differential
line driver output only)
400 ms
Resolution settings (set at factory to 10 μm for
PL25 and 4 μm for PL60)
A
B
1/4 Z
Z
AL
Fig. 3-2
• Th
e A/B phase output phase diff erence changes in integral multiples of 50 ns.
• For MJ100 voltage diff erential line driver output, the minimum phase diff erence is 100 ns.
Be sure to use a travel speed for the scale that the receiver is able to handle.
• With MJ110 open collector output, the minimum phase diff erence may vary depending on the cable length and load resistance.
Th e MJ110’s minimum phase diff erence of 1 μs is the minimum phase diff erence for when an alarm is output.
With an output cable length of 30 m and a load resistance of 50 mA, the transistors may not be able to comply under a phase diff erence
of approximately 2 μs.
• Alarm signal output is output for approximately 400 ms from the point the alarm is generated and automatically canceled as soon as
the cause of the alarm is eliminated.
• Th
e A/B phase signals are at high impedance during output of the alarm signal. (MJ100)