7 POSITIONING MODULE REPLACEMENT
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7.6.6 Precautions for the replacement of the AD70 by the QD73A1
The following shows precautions for the replacement of the AD70 by the QD73A1.
*1 Note the following because the number of occupied slots increases for the QD73A1.
1) Check that the base unit has empty slots of 1 slot (or more).
If the base unit does not have an empty slot, an additional extension base unit is required.
2) The module occupying 2 slots cannot be mounted on the Q series large type base unit.
Because the same base unit of the existing module is used for the QD73A1, when mounting the QD73A1 on the Q
series large type base unit, use 2 base units by adding an extension base unit.
*2 Configure the I/O assignment setting of parameters in either of following ways so that addresses of the QD73A1 remain the
same as the AD70 even after the replacement.
1) Set Empty 0 point to the first half slot.
2) Set the same address of the AD70 to the second half slot of the QD73A1 in the start XY setting.
*3 Changes or corrections of the programs are required.
For details, refer to the MELSEC-Q QD73A1 Positioning Module User's Manual.
*4 The method of mode setting, which is required for the positioning, is changed from a hardware switch to the switch setting
in I/O assignment of PLC parameter.
Configure the same setting as the AD70 by referring to the MELSEC-Q QD73A1 Positioning Module User's Manual.
*5 Items indicated with the LEDs can be checked with I/O signals of the QD73A1.
If necessary, install lamps corresponding to the LED indications externally and indicate the on/off status of the I/O signals
using a program.
*6 The position where a module is mounted is changed because the dimensions of a base unit of the QD73A1 differ.
Check whether the wiring is enough even after the replacement because the connector position is changed though the
existing connectors can be used without the wiring change.
Item AD70 QD73A1 Precautions
Number of occupied slots 1 slot 2 slots *1
Number of occupied I/O
points
32 points
(I/O assignment: Special function module,
32 points)
48 points
(I/O assignment:
First half slot: Empty 16 points
Second half slot: Intelli., 32 points)
*2
Buffer memory address
• Addresses are partly changed.
• New items are added due to the specification change.
*3
Mode setting Hardware switch setting
Parameter setting of a CPU module
("I/O assignment" "Switch setting")
*4
LED • Items indicated with the LEDs differ between the AD70 and the QD73A1. *5
External wiring • The existing connectors can be used. *6*7
Operation of when Servo
READY signal is off
The AD70 counts the feedback pulse, and
outputs the voltage proportional to the
deviation counter.
The QD73A1 clears the deviation counter
to 0, and outputs 0V.
*8
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