839
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Basic I/O Unit Instructions
3
IORD
IORD
Applicable Program Areas
Operands
Note If IORD(222) is executed for a CPU Bus Unit running under a CPU Unit that does not support using IORD(222) for
CPU Bus Units, an error will occur and the ER Flag will turn ON.
C: Depends on Special I/O Unit or CPU Bus Unit.
S: Special I/O Unit: 0000 to 005F hex
(to specify unit numbers 0 to 95)
CPU Bus Unit: 8000 to 800F hex
(to specify unit numbers 0 to F hex)
S+1: Number of words to transfer
(0001 to 0080 Hex, depends on Special I/O Unit or CPU Bus Unit)
z Operand Specifications
Flags
Instruction Mnemonic Variations
Function
code
Function
INTELLIGENT I/O READ IORD @IORD 222
Reads the contents of memory area of a Special
I/O Unit or CPU Bus Unit.
Symbol
IORD
Area
Function block
definitions
Block program areas Step program areas Subroutines Interrupt tasks
SFC action or
transition programs
Usage OK OK OK OK OK OK
Operand Description Data type Size
C Control data UINT 1
S Transfer source and number of words UDINT 2
D Transfer destination UINT Variable
Area
Word addresses
Indirect DM/EM
addresses
Con-
stants
Registers Flags
Pulse
bits
TR
bits
CIO WR HR AR T C DM EM
@DM
@EM
*DM
*EM
DR IR
Indirect
using IR
TK CF
C
OK OK OK OK OK OK OK OK OK OK
OK
OK
--- OK --- --- --- ---S
---
D ---
Name Label Operation
Error Flag P_ER • ON if the number of words to transfer (S) is outside the range of 0001 to 0080 hex.
• ON if the unit number (S) is outside the range of 0000 to 005F hex or 8000 to 800F hex.
• ON if the designated Special I/O Unit is on SYSMAC BUS.
• ON if a Special I/O Unit or CPU Bus Unit not affected by IORD(222) is designated.
• With the CS1D CPU Units: ON if the active and standby CPU Units could not be synchronized.
• OFF in all other cases.
Equals Flag P_EQ • ON if reading operation is completed normally.
• OFF if reading operation is not completed normally.
C: Control data
S: Transfer source and number of words
D: Transfer destination
IORD(222)
C
S
D
S+1 S
S+1: Leftmost 4 digits
S: Rightmost 4 digits
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