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3.6 Buffer Memory Details
3.6.1 Module status area
3
SPECIFICATIONS
3.6 Buffer Memory Details
This section explains the buffer memory details.
(1) The values stored in buffer memory are cleared when the programmable
controller is powered ON from OFF, or the programmable controller CPU is
reset.
(2) When a value of 65536 or more is stored in the area composed of one word, a
count is stopped at FFFFh (65535).
(3) If a value of more than two words is stored in the area composed of two
words, a count is stopped at FFFFFFFFh (4294967295).
3.6.1 Module status area
The ON/OFF status of the MES interface module LED, setting status of the intelligent
function module switches, and battery status are stored.
Refer to the following for details.
• Section 4.3 Parts Names
• Section 4.5 Intelligent Function Module Switch Settings
3.6.2 Network connection status area
The status of network connection to which the MES interface module is currently
connected is stored.
(1) Storage example of IP address (Buffer memory address: 55 to 56)
For 192. 168. 3. 3, each octet (192 (first octet). 168 (second octet). 3 (third octet). 3
(fourth octet)) is stored as follows:
(2) Storage example of Subnet mask (Buffer memory address: 57 to 58)
For 255. 255. 255. 0, each octet (255 (first octet). 255 (second octet). 255 (third octet).
0 (fourth octet)) is stored as follows:
03H (3)
C0
H (192)
03
H (3)
A8
H (168)
b15 b8
to
b7 b0
to
Buffer memory address: 55
56
First octet value Second octet value
Third octet value Fourth octet value
FFH (255)
FF
H (255)
00
H (0)
FF
H (255)
b15 b8
to
b7 b0
to
Buffer memory address: 57
58
First octet value Second octet value
Third octet value Fourth octet value