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7
PARAMETER SETTING
7 - 9
(f)
Split reception monitoring timer value
1)
Set the time from the receipt of the first message segment until the
receipt of the last message segment in the case where messages split
on a TCP/UDP level are received.
2)
No setting is required when the default value is used.
REMARK
(1)
Specify the QJ71MT91 side timer values that will satisfy the following
conditions.
1
Automatic
•
communication response
monitoring timer value
2
Response monitoring
•
timer value for dedicated
instruction
*1:
Automatic communication response monitoring timer value is a response
monitoring timer value for the automatic communication function.
Refer to Section 7.3 for details.
*2:
Refer to Section 10.2 or 10.3 for details.
When making communication between two QJ71MT91s, perform the same
settings to both modules.
(2)
Specify the target device side timer values that will satisfy the following
conditions.
If the timer values are not as indicated below, communication errors, such as
send time-out, may occur frequently.
•
Monitoring timer value on target
•
device side application software
1: n indicates a TCP split transmission count, which is obtained from the following calculation.
Message size sent by QJ71MT91
n
Maximum Segment size
2: Refer to Section 7.3 for the CPU response monitoring timer value.
(Example 1) TCP split transmission count for communication on the same line
The Maximum Segment size is 1460 bytes on the same line (with no
router relayed) and the TCP split transmission count is as described
below.
When QJ71MT91 send message size ≤ 1460 bytes, n = 1
When 1460 bytes < QJ71MT91 send message size, n = 2
Split reception
TCP ULP
monitoring
timer
timer value
value
Split reception
TCP ULP
monitoring
timer
timer value
value
CPU response
monitoring
timer value
MELSEC-Q
TCP end
TCP
timer
resend
value
timer value
TCP end
TCP
timer
resend
value
timer value
2
QJ71MT91 side
n
TCP ULP timer
value
rounded up to nearest integer
IP
reassembly
timer value
IP
reassembly
timer value
1
7 - 9
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