
B-62714EN/04 OPERATION 1.16/18/21-B, 16/18-C, LCD-MOUNTED TYPE 16i/18i/21i-A/B
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Setting items and display items
Setting items
Table III-1-1
Item Description
MAX SLAVE NO.
Maximum slave station number used for
communication with the master station.
Setting range: 1 to 31
SCAN TIME
Interval for performing one scan of input/output
service.
Set a value greater than the value of REFRESH
TIME.
Guideline for setting:
SCAN TIME = MAX SLAVE NO. × 2 + 2
Setting unit: 2 msec
Setting range: 1 to 9999
Example of setting:
When 4 is set in SCAN TIME, the setting of 8 msec
is assumed.
STATUS ADDRESS
Start address of an area for storing communication
status.
Setting range: R area of the PMC
OPTION1
Slave station communication monitoring time
Recommended setting: 14 [hexadecimal] → 40 msec
Setting unit: msec
Setting range: 03 to D0 (hexadecimal)
OPTION2
Successive error detach detection counter.
Recommended setting: 3 [hexadecimal]
Setting range: 00 to FF (hexadecimal)
When the default value 0 is used, the setting of 3 is
assumed for operation.
DI/DO MAP MODE
Determines the method of allocating a DI/DO data
area.
Setting: 1, 2
1: A DI data area and DO data area are allocated for
the number of stations set in MAX SLAVE NO..
2: A DI data area is allocated for the number of
stations set in MAX SLAVE NO., and a DO data
area is allocated for one station.
DI/DO DATA SIZE
DI/DO data area size.
Setting range: 0 to 62 (16/18/21-B, 16/18-C)
Setting range: 0 to 128 (LCD-mounted type
16i/18i/21i-A)
(Unit: Bytes)
DO ADDRESS
DO data area start address.
Setting range: R area of the PMC
DI ADDRESS
DI data area start address.
Setting range: R area of the PMC
MESSAGE SIZE Not used
OUTPUT ADDRESS Not used
INPUT ADDRESS Not used