Mitsubishi MELSEC L Series User Manual page 183

(2) Changing the no-reception monitoring time (timer 0)
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(a) Changing the no-reception monitoring time (timer 0)
The no-reception monitoring time (timer 0) is designated by the number of
transmitted characters (byte count) corresponding to the data
communication rate set in the interface, and then it is registered on the GX
Configurator-SC's "Transmission control and others system setting" screen.
Adjust or set the value based on the specifications of the external device.
(b) No-reception monitoring time format specification in non procedure protocol
(Format 0/Format 1)
The no-reception monitoring time format in non procedure protocol is
specified to use the no-reception monitoring time (timer 0) by the non
procedure protocol and is registered on the "Non procedure system setting"
screen.
REMARKS
1) When changing the no-reception monitoring time (timer 0)
Find the result using the following expression and set the number of bytes or
greater for the no-reception monitoring time (timer 0).
No-reception monitoring time (timer 0) = 1 +
Td : Maximum delay time for external device output processing (ms)
Vbps: Transmission rate (bps)
(Example) Calculation of no-reception monitoring time (timer 0)
• Transmission rate (Vbps)
• Maximum delay time for external device output processing (Td) : 50ms
No-reception monitoring time (timer 0) = 1 +
In this case, actual monitoring time is as follows:
41 bytes 12
1 Number of transmit bits per byte (Fixed)
6 CHANGING THE DATA COMMUNICATIONS MONITORING TIMES
(Round up fractions below decimal point.)
1
/ 9600 1000 = 51.25ms
Td Vbps
12000
: 9600bps
50 9600
= 41 bytes
12000
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