PD8-6262 Explosion-Proof Dual Analog Input Flow Rate/Totalizer
Instruction Manual
54
Noise Filter (
filter
)
The noise filter is available for unusually noisy signals
that cause an unstable process variable display. The
noise filter averages the input signal over a certain
period. The filter level determines the length of time
over which the signal is averaged. The filter level can
be set between 2 and 199. The higher the filter level,
the longer the averaging time and so the longer it
takes the display to settle to its final value. Setting the
filter level to zero disables the filter function.
Noise Filter Bypass (
bypass
)
The noise filter bypass changes the behavior of the
totalizer so that small variations in the signal are
filtered out but large abrupt changes in the input
signal are displayed immediately. The bypass value
determines the minimum amount of signal change to
be displayed immediately. All signal changes smaller
than the bypass value are filtered or averaged by the
totalizer. The noise filter bypass may be set between
0.1 and 99.9% of full scale.
Rounding Feature (
round
)
The rounding feature is used to give the user a
steadier display with fluctuating signals. Rounding is
used in addition to the filter function.
Rounding causes the display to round to the nearest
value according to the rounding selected. This setting
affects the last two digits, regardless of decimal point
position. See examples below:
Rounding
Selection
Actual
Value
Display
Value
Actual
Value
Display
Value
1
12.022
12.022
12.023
12.023
5
12.022
12.020
12.023
12.025
10
12.024
12.020
12.025
12.030
Modbus RTU Serial
Communications (
serial
)
The totalizer is equipped with serial communications
capability as a standard feature using Modbus RTU
Serial Communication Protocol.
The totalizer may be connected to a PC for initial
configuration via the onboard USB connection. For
ongoing digital communications with a computer or
other data terminal equipment, use the RS-485
connection with the appropriate serial converter; see
•
DO NOT
connect any equipment to the RJ45
M-LINK connector. Otherwise damage will occur
to the equipment and the totalizer.
•
DO NOT
disconnect the RJ45 connector located
to the left of the power terminal block. Doing so
will disable the on-board digital I/O, and the
RS-485 serial communications.
Notes:
1.
More detailed instructions are provided with each
optional serial communications adapter.
2.
Refer to the ProtEX-MAX Modbus Register Tables
located at
When using more than one totalizer in a multi-drop
mode, each totalizer must be provided with its own
unique address. The meter address (Slave ID) may
be programmed between 1 and 247. The transmit
delay may be set between 0 and 199 ms. The parity
can be set to even, odd, or none with 1 or 2 stop bits.
