Ioref (i/o refresh), Ioref (i/o refresh) -5 – IDEC MicroSmart User Manual
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18: P
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18-5
IOREF (I/O Refresh)
Applicable CPU Modules
Valid Operands
Only input or output numbers available on the CPU module can be designated as S1. Input and output numbers for expan-
sion I/O modules cannot be designated as S1. For the valid operand number range, see pages 6-1 and 6-2.
Input Operand Numbers and Allocated Internal Relays
Note *: Slim type CPU modules FC4A-D40K3 and FC4A-D40S3 cannot use I10 through I15 as source operand S1; only I0
through I7 can be designated as source operand S1 for the FC4A-D40K3 and FC4A-D40S3.
During normal execution of a user program, I/O statuses are refreshed simultaneously when the END instruction is exe-
cuted at the end of a scan. When a real-time response is needed to execute an interrupt, the IOREF instruction can be used.
When the input to the IOREF instruction is turned on, the status of the designated input or output is read or written imme-
diately.
When the IOREF instruction is executed for an input, the filter does not take effect and the input status at the moment is
read to a corresponding internal relay.
The actual input status of the same input number is read to the internal input memory when the END instruction is exe-
cuted as in the normal scanning, then the filter value has effect as designated in the Function Area Settings. See page 5-24.
FC4A-C10R2/C
FC4A-C16R2/C
FC4A-C24R2/C
FC4A-D20K3/S3
FC4A-D20RK1/RS1 & FC4A-D40K3/S3
X
X
X
X
X
Operand
Function
I
Q
M
R
T
C
D
Constant
Repeat
S1 (Source 1)
I/O for refresh
X
X
—
—
—
—
—
—
—
Input Operand
Internal Relay
Input Operand
Internal Relay
Input Operand
Internal Relay
I0
M300
I5
M305
I12 *
M312
I1
M301
I6
M306
I13 *
M313
I2
M302
I7
M307
I14 *
M314
I3
M303
I10 *
M310
I15 *
M315
I4
M304
I11 *
M311
When input is on, 1-bit I/O data designated by source operand S1 is refreshed immedi-
ately regardless of the scan time.
When I (input) is used as S1, the actual input status is immediately read into an internal
relay star ting with M300 allocated to each input available on the CPU module.
When Q (output) is used as S1, the output data in the RAM is immediately written to the
actual output available on the CPU module.
IOREF
S1
*****