409
and the Carry Flag (A50004) will turn ON. Be sure to control execution of these
instructions so that no more than two are being executed simultaneously for
Units connected under the same Master.
This instruction cannot be used to write data to Special I/O Units mounted to
Slave Racks in SYSMAC BUS Remote I/O Systems. It can be used for Units
mounted to Slave Racks in SYSMAC BUS/2 Systems as long as the the follow-
ing conditions are met.
1, 2, 3...
1. The lot number of the Remote I/O Master Unit and Remote I/O Slave Unit
must be the same as or latter than the following.
1992
October (Y: November; Z: December)
1st
01 X 2
2. The DIP switch on the Remote I/O Slave Unit must be set to “54MH.” (Only
four Slaves can be connected to each Master when this setting is used.)
3. The Special I/O Unit must be one of the following: AD101, CT012, CT041,
ASC04, IDS01-V1, IDS02, IDS21, IDS22, LDP01-V1, or NC222.
4. No more than one READ(190) and/or WRIT(191) cannot be executed for
the same Special I/O Unit at the same time. Be sure the first instruction has
completed execution before starting execution of another
READ(190)/WRIT(191) instruction.
Note Refer to page 115 for general precautions on operand data areas.
Flags ER (A50003): Content of *DM word is not BCD when set for BCD.
D is not allocated to a Special I/O Unit.
N is not BCD.
Instruction executed transferring more than 255 words to a
Special I/O Unit on a SYSMAC BUS/2 Slave Rack.
The Slave is not set to 54MH.
CY (A50004): This Flag operates only for Special I/O Units mounted to
SYSMAC BUS/2 Slave Racks and turns on for the following:
The Special I/O Unit or Slave is busy.
An error has occurred in the Special I/O Unit.
Word operands have been designated for a Special I/O Unit
that requires a constant.
The communications path is not normal.
EQ (A50006): OFF while data is being written; ON when writing has been
completed.
Example 1 When CIO 000001 is ON in the following example, the number of words speci-
fied in CIO 0001 is read consecutive from words starting at D00010 and trans-
ferred to the Special I/O Unit through CIO 0004 (the I/O word allocated to the
Special I/O Unit).
Special I/O Instructions Section 5-35
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