Mitsubishi Electric MELSEC iQ-R Series User Manual page 82

■PLC No.1 in the setting 2
Communication area setting (refresh setting)
(1)
(3)
(5)
■PLC No.2 in the setting 2
Communication area setting (refresh setting)
(1)
(3)
(5)
Using Shared Memory
The following section shows the advisability of using the shared memory by the type of transmission message.
Refresh range
Within programmable
controller CPU
Within C Controller
module
*1 Higher speed performance can be obtained if items contained in the received message are written in the refresh area.
*2 If a device in which received data is stored is not updated when a reception notification trigger is detected, use a device in the CA-SECS
device assignment (I/O assignment) area for which the cache settings are configured instead of the refresh area.
7 BASIC FUNCTIONS
80
7.6 Device Assignment
Device setting Transmission message
example
M0 to M255 Sending
Receiving
D0 to D1023 Sending
Receiving
M256 to M511 Sending
Receiving
D1024 to D2047 Sending
Receiving
Shared memory setting
(1)
(2)
(2)
(4)
(3)
(4)
(5)
Shared memory setting
(1)
(2)
(2)
(4)
(3)
(4)
(5)
Programmable controller CPU turns trigger ON
• SECS/GEM communication software detects trigger by automatic refresh
• SECS/GEM communication software directly turns trigger device OFF to
establish trigger handshake
SECS/GEM communication software directly turns trigger device ON
• Programmable controller CPU detects trigger and turns device OFF.
• SECS/GEM communication software detects trigger by automatic refresh
to establish trigger handshake
Programmable controller CPU writes data to register
SECS/GEM communication software directly controls device and writes
*1
data to register
Programmable controller CPU turns trigger ON
• This action will not rewrite the refresh area of the C Controller module, so
the shared memory is not available. Suitable for assignment of CA status
notification setting.
SECS/GEM communication software directly turns trigger device ON
• Programmable controller CPU detects trigger and turns device OFF.
• This action will not rewrite the refresh area of the C Controller module, so
the shared memory is not available.
Writing data to the register by the programmable controller CPU will not
rewrite the refresh area of the C Controller module, so the shared memory
is not available.
SECS/GEM communication software writes data to refresh area
• Programmable controller CPU can refer to the refresh area as a
*1,*2
device.
Availabil
ity
Available
Available
Available
Available
Not
available
Not
available
Not
available
Available