4 INTELLIGENT COMMUNICATION MODULE REPLACEMENT
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4.6.2 Replacement of intelligent communication module A1SD51S
(1) Usable channels
Usable channels are as shown below.
(a) Use in the QD51
When the A1SD51S is replaced with the QD51, CH.3 (RS-422/485) interface is not available.
Modify the BASIC program so that other channels may be used, or use the QD51-R24.
(b) Use in the QD51-R24
Since the QD51-R24 does not have CH. 2 (RS-232) and CH. 4 (Parallel) interfaces is not allowed.
When the A1SD51S is replaced with the QD51-R24, CH.2 (RS-232) interface cannot be used.
Modify the BASIC program so that other channels may be used, or use the QD51.
(2) Communications specifications
Data bit and stop bit settings differ between the models. Correct the BASIC program.
(3) Common memory backup
Common memory backup is as shown below.
In the QD51 (-R24), common memory is not backed up by a battery. If backup is necessary, use the
programmable controller CPU's file register (R).
Modify the program that accesses the common memory using GETMEM and PUTMEM instructions to
access the file register (R) using PCRD and PCWT instructions.
: Usable, ×: Unusable.
Item A1SD51S QD51 QD51-R24
CH. 1 (RS-232)
CH. 2 (RS-232) ×
CH. 3 (RS-422/RS-485) ×
Item A1SD51S QD51(-R24)
Data bit 5, 6, 7, 8 7, 8
Stop bit 1, 1.5, 2 1, 2
Item A1SD51S QD51(-R24)
Common memory Backed up Not backed up
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