Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 232

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10 CHANGING DATA COMMUNICATION MONITORING TIME
10.1 No-reception Monitoring Time (timer 0) Setting
Remarks
■When changing the no-reception monitoring time (timer 0)
Set the no-reception monitoring time (timer 0) to the following number of bytes or greater.
Td : Maximum delay time for target device output processing (ms)
Vbps: Transmission rate (bps)
Ex.
Calculation of no-reception monitoring time (timer 0)
Transmission rate (Vbps) : 9600 bps
Maximum delay time for target device output processing (Td) : 50 ms
In this case, actual monitoring time is as shown below:
41 bytes  12
*1
 9600  1000 = 51.25 ms
*1 Number of transmit bits per byte (Fixed)
■When changing the no-reception monitoring time (timer 0) for data communication with a
target device through C24 RS-422/485 interface
Set the no-reception monitoring time (timer 0) to the following number of bytes or greater.
Td : Maximum delay time for target device output processing (ms)
T1 : Target device side hardware gate OFF time (ms)
Vbps: Transmission rate (bps)
Td × Vbps
12000
No-reception monitoring time (timer 0) = 1 +
(Round up fractions below decimal point.)
50 × 9600
12000
No-reception monitoring time (timer 0) = 1 +
= 41 bytes
(Td + T1) × Vbps
12000
No-reception monitoring time (timer 0) = 1 +
(Round up fractions below decimal point.)