4 INTELLIGENT COMMUNICATION MODULE REPLACEMENT
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4.6.1 Replacement of intelligent communication module AD51H-S3
(1) Usable channels
Usable channels are as shown below.
(a) Use in the QD51
Since the QD51 does not have CH. 3 (RS-422/485) and CH. 4 (Parallel) interfaces, using existing
programs is not allowed.
Modify the BASIC program for CH. 3 (RS-422/485) to the other channels or use the QD51-R24.
CH. 4 (Parallel) is not provided.
(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.
Modify the BASIC program for CH. 2.(RS-232) to the other channels or use the QD51.
CH. 4 (Parallel) is not provided.
(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.
(4) Maximum number of tasks
The maximum number of tasks that can be run at the same time is as shown below.
In the QD51 (-R24), a maximum of only 2 BASIC programs can be run at a time.
4.6 Reuse of Existing Programs
: Usable, ×: Unusable.
Item AD51H-S3 QD51 QD51-R24
Channel
CH. 1 (RS-232)
CH. 2 (RS-232) ×
CH. 3 (RS-422/RS-485) ×
CH. 4 (Parallel) × ×
Item AD51H-S3 QD51(-R24)
Data bit 5, 6, 7, 8 7, 8
Stop bit 1, 1.5, 2 1, 2
Item AD51H-S3 QD51(-R24)
Common memory Backed up Not backed up
Item AD51H-S3 QD51(-R24)
Max. number of tasks 8 2
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