ONICON System-10 MODBUS - Manual (Page 30)

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System-10-MOD Network Interface Installation Guide 05/14 - 0653-10 / 18321
Page 30
REPORTED PROBLEM POSSIBLE SOLUTIONS
Network communications are disrupted when the
device is connected (cont.) • Shield drain connections should be daisy
chained in the same manner as the signal
cables for RS485. The shield drain wire
should be left unterminated at the end of
the cable and connected to earth only at the
network master controller. Shield wires must
not be connected to the RS485 connector on
the System-10.
There are time out errors when polling the
device. • What registers are you polling for? Polling for
invalid registers will slow the response time.
The range of valid integer registers is 40001
– 40068. The range of valid floating point
registers is 41003 – 41081.
• Resetting totals requires the network
controller to write a 1 to a register in our
device. This takes longer to accomplish than
simply reading registers. This can lead to time
out issues. When dealing with time out errors,
temporarily extend the allowable delay to see
if the problem will go away.