Mitsubishi Electric MELSEC iQ-R Series User Manual page 159

No. Name Description
SD300 Number of points Z
assigned to the
index register
SD302 Number of points LZ
assigned to the long
index register
SD306 Number of points ZR (L)
assigned to the file
SD307 ZR (H)
register
SD308 Number of points RD (L)
assigned to refresh
SD309 RD (H)
devices
Fixed scan function information
The following table lists the special register areas relating to the fixed scan function information.
No. Name
SD480 Inter-module synchronization
cycle over count
*1
SD520 Current scan time
SD521
*1
SD522 Minimum scan time
SD523
*1
SD524 Maximum scan time
SD525
*1 The scan time of the remote head module shows the interval of the I/O refresh and intelligent function module (including a network
module) refresh.
Details
The number of points assigned to the Z device is stored.
Fixed to 0.
The number of points assigned to the LZ device is stored.
Fixed to 0.
The number of points assigned to the ZR device is stored in 32 bits.
Fixed to 0.
The number of points assigned to the RD device is stored in 32 bits.
Fixed to 12288.
Description Details
0: No cycle overrun event The number of counts in which the inter-module
1 to 65535: Cumulative synchronous I/O refresh, intelligent function module
number of times refresh, and data transfer between the devices have
not been completed is stored within the inter-module
synchronization cycle. When the count exceeds 65535,
it returns to 0 and starts a new cycle.
Current scan time (unit: ms) • The current scan time is stored into 'Current scan
time' (SD520) and 'Current scan time' (SD521). (The
Current scan time (unit: s)
time is measured in increments of s).
'Current scan time' (SD520): The ms part is stored.
(Range: 0 to 65535)
'Current scan time' (SD521): The s part is stored.
(Range: 0 to 999)
Example: If the current scan time is 23.6ms, the
following values are stored:
SD520 = 23
SD521 = 600
• This register is cleared to 0 when the mode transfers
from STOP to RUN mode.
Minimum scan time (unit: ms) • The scan time is stored into 'Minimum scan time'
(SD522) and 'Minimum scan time' (SD523). (The
Minimum scan time (unit: s)
time is measured in increments of s).
'Minimum scan time' (SD522): The ms part is stored.
(Range: 0 to 65535)
'Minimum scan time' (SD523): The s part is stored.
(Range: 0 to 999)
• This register is cleared to 0 when the mode transfers
from STOP to RUN mode.
Maximum scan time (unit: • The scan time is stored into 'Maximum scan time'
ms) (SD524) and 'Maximum scan time' (SD525). (The
time is measured in increments of s).
Maximum scan time (unit: s)
'Maximum scan time' (SD524): The ms part is stored.
(Range: 0 to 65535)
'Maximum scan time' (SD525): The s part is stored.
(Range: 0 to 999)
• This register is cleared to 0 when the mode transfers
from STOP to RUN mode.
Set by (setting
timing)
S (Initial)
S (Initial)
S (Initial)
S (Initial)
Set by (setting
timing)
S (Status change)
S (Always)
S (Always)
S (Always)
Appendix 4 List of Special Register (SD) Areas
A
APPX
157