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Fig. 4.10 Slave configuration in Master mode
Note:
If PR200 is a master in the Modbus network, it is necessary to observe the following rules to
speed up the polling of all slaves:
If one or more slaves are disconnected or not accessible, it is recommended to block
the polling of these slaves in the program using the parameter
Start query
or to
minimize the parameter
Timeout
for these slaves. Otherwise, the response time is
significantly increased with the number of unavailable slaves and the sum of time-
outs.
When setting the master parameter
Interval between requests
(Fig. 4.9), the
number of slaves and the total number of requests must be taken into account. If the
total polling takes actually longer than the set value, this parameter will be ignored.
4.4
Service modes
To switch the device to one of the two service modes, use the jumpers XP2 and XP3 on the
top PCB (Fig. 4.11).
WARNING
The voltage on some components on the circuit board can be dangerous. Direct
contact with the circuit board or penetration of a foreign body in the enclosure must
be avoided.
NOTICE
Do not set the jumpers XP2 and XP3 at the same time, otherwise the device can be
damaged.