Computer Hardware User Manual

352
When the execution condition is OFF, IOWR(––) is not executed. When the
execution condition is ON, IOWR(––) transfers data from the words beginning at
D to the specified Special I/O Unit’s memory. The destination information pro-
vides the node number of the Special I/O Unit and the number of words to be
written, as shown in the following diagram.
D:
Digits 2 to 4: Number of words to write (001 to 128)
Digit 1: Node number of the Special I/O Unit (0 to F)
The control code (C) depends on the Special I/O Unit being specified. Refer to
the Unit’s Operating Manual for details.
Example When IR 00000 goes from OFF to ON, the following instruction writes the con-
tents of the 10 words from DM 0100 through DM 0109 to the memory area of
Special I/O Unit number 2.
IOWR(––)
C
DM 0100
#2010
00000
Address Instruction Operands
00200 LD 00000
00201 @IOWR(––)
C
DM 0100
#2010
Flags ER: The last three digits of D (number of words specifier) isn’t BCD or isn’t
within the range of 001 through 128.
Indirectly addressed DM word is non-existent. (Content of DM word is
not BCD, or the DM area boundary has been exceeded.)
The destination Unit’s unit number isn’t 0 to F or it is mounted on a Slave
Rack.
The instruction wasn’t completed normally.
EQ: ON when the data was read successfully, otherwise OFF.
Description
Special I/O Unit Instructions Section 5-29