Endress+Hauser Proline Promass 83 - Page 80

7 Block OUTPUTS Device Functions Proline Promass 83 MODBUS RS485
80 Endress+Hauser
PULSE WIDTH
(continued)
4223
! Note!
When entering the pulse width, select a value that can still be processed by an
external totalizer (e.g. mechanical totalizer, PLC, etc.).
" Caution!
If the pulse number or frequency resulting from the pulse value entered (see
function PULSE VALUE (4222) on Page 79) and from the current flow is too large
to maintain the pulse width selected (the time interval is smaller than the pulse
width B entered), a system error message is generated (# 359 to 362, pulse buffer)
after approx. 5 seconds buffer/balance time.
MEASURING
MODE
MODBUS register:
Data type:
Access:
4225
3228
Integer
read/write
! Note!
Function is not available unless the PULSE setting was selected in the
OPERATION MODE function (4200).
Use this function to define the measuring mode for the pulse output.
Options:
0 = STANDARD
Only positive flow components are totaled. Negative components are not taken
into account.
1 = SYMMETRY
Positive and negative flow components are taken into account.
! Note!
The direction of flow can be output via the relay output.
2 = PULSATING FLOW
If flow is characterized by severe fluctuations as is the case, for example, with
reciprocating pumps, the positive and negative flow components are totaled, with
the signs taken into account (e.g. -10 l and +25 l = 15 l).
Flow components outside the maximum pulse number per second (value/width)
are buffered, balanced and output after a maximum delay of 60 seconds. If the
buffered data cannot be processed within approx. 60 seconds, a fault/notice
message appears.
Under certain plant conditions, flow values can aggregate in the buffer, for
example in the case of prolonged and unwanted fluid backflow. However, this
buffer is reset in all relevant programming adjustments which affect the pulse
output.
3 = STANDARD REVERSE
Only negative flow components are totaled. Positive components are not taken
into account.
Factory setting: STANDARD
Function description
OUTPUTS → PULSE/FREQUENCY OUTPUT 1 → CONFIGURATION (PULSE)