DLG LMP-100, Руководство пользователя

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LMP-100
PROFIBUS/MODBUS GATEWAY
Page 14 of 40 LMP-100 User Manual MAN-EN-DE-LMP100-01.00_14
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between the start of consecutive Modbus scanning cycles.
For example, assuming a period of 5000 ms the device
ensures that the next scan cycle will start at least 5000 ms
after the current scan cycle. Value 0 indicates that the next
scan cycle should begin immediately after the end of the
current scan cycle.
Factors such as number of variables, timeouts and
retransmissions can cause the total time taken to scan all
variables to be greater than the configured scan cycle
period. In this case, the next scan cycle start immediately
after the end of the current scan cycle.
Modbus response timeout
(ms)
Maximum time in milliseconds that the LMP-100 waits to
receive a response from a Modbus slave. If the slave does
not respond within this time, the LMP-100 considers it as a
failure and resends the command.
Allowed values lie in the range from 10 to 60000 ms.
Modbus retries
Number of retransmission attempts of a command.
Retransmissions occur when the slave does not respond or
when the slave sends an incorrect response. Allowed values
lie in the range from 0 to 5.
Value 0 indicates no retries.
Modbus interframe silence
Time waited by the LMP-100 to send a new command after
receiving a response from a Modbus slave.
The possible values are:
•
0 ms
•
10 ms
•
100 ms
•
500 ms
•
1000 ms
The wait interval is useful to allow the slave which sent the
response to be able to change the RS-485 transceiver
direction from “transmit” to “receive”.
The LMP-100 is configured by default to wait for 10 ms, a
suitable value for most installations. Therefore, change this
parameter only when really necessary.
Table 1 – Modbus network parameterization