Interface Specifications Comparison With External Devices - Mitsubishi Electric MELSEC-A/QnA Series Handbook

7
POSITIONING MODULE REPLACEMENT

7.4.5 Interface specifications comparison with external devices

For the external interface specifications, the following shows the differences between AD75P-S3 and
QD75PN/QD75DN.
*1
Item
Drive unit READY
Upper/lower limit signal
Stop signal
Near-point dog signal
Input
Speed-position switching signal
Zero signal
Manual pulse generator
Pulse
Output
Deviation counter clear
*1 For the external start and in-position signal of which QD75PN/QD75DN does not have, they are not described.
The column of interface specifications differences is described as the form, [Specifications of AD75P-S3] 
*2
[Specifications of QD75PN/QD75DN].
*3 The response time difference (0.2 ms) of AD75P-S3 and QD75PN/QD75DN is the time difference of 1pls part for
creep speed of 5000pps.
When the accuracy is required, it is required for the creep speed to be low enough value.
*4 If the chattering time is long when the near-point watchdog signal is turned on, the OFF status may be detected shortly
after the ON status of the signal is detected (under changing into the creep speed). In this case, the QD75PN/QD75DN
outputs an error and stops the OPR control.
Differences as Interface specifications
-
-
-
Input resistance: 4.7k4.3k
Response time: 4ms  1ms
Input resistance: 4.7k7.7k
Response time: 4ms  1ms
Input resistance: 3.5k4.7k(at input of
24V)
0.5k0.62k(at input of 5V)
*3
Response time: 0.8ms1ms
ON voltage : 2.5V2.0V (at input of 5V)
ON current: 3.5mA2mA
-
-
: Compatible, : Partial change required
Compat-
*2
Precautions for replacement
ibility
<When the machine OPR for the
near-point watchdog signal method is
used>
The input response time for the
QD75PN/QD75DN is shorter
than the A1SD75P-S3.
If a sensor, which the chattering time
when the near-point watchdog signal
is turned on is long, is used, an error
may occurs due to the false detection
of the ON/OFF status.
Check specifications for the sensor.
Including the response time
differences, reconfirming is required.
*4
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