Endress+Hauser Proline Promass 83 - Page 94

7 Block OUTPUTS Device Functions Proline Promass 83 MODBUS RS485
94 Endress+Hauser
ASSIGN RELAY
(continued)
4700 Advanced selection: with the optional SW package ADVANCED DIAGNOSIS
84 = LIMIT MASS FLOW DEVIATION
85 = LIMIT DENSITY DEVIATION
86 = LIMIT REFERENCE DENSITY DEVIATION
87 = LIMIT TEMPERATURE DEVIATION
88 = LIMIT TUBE DAMPING DEVIATION
89 = LIMIT ELECTRODYNAMIC SENSOR DEVIATION
112 = OPERATING FREQUENCY FLUCTUATION DEVIATION
113 = TUBE DAMPING FLUCTUATION DEVIATION
Factory setting: FAULT MESSAGE
! Note!
• It is very important to read and comply with the information on the switching
characteristics of the relay output, (see Page 100).
• It is advisable to configure at least one relay output as a fault output and define
the outputs' response to error.
• The relay output is configured as a normally open (NO or make) contact by
default. It can be reconfigured as a normally closed (NC or break) contact by
means of a jumper on the relay module (see Operating Instructions BA107D).
• If you select OFF or ON, the only function shown in the CONFIGURATION
function group is the function ASSIGN RELAY (4700).
ON-VALUE
MODBUS register:
Relay output 1
Relay output 2
Data type:
Access:
4701
3802
4002
Float
read/write
! Note!
Function is not available unless LIMIT VALUE or FLOW DIRECTION was
selected in the ASSIGN RELAY function (4700).
Use this function to assign a value to the switch-on point (relay output pulls up).
The value can be higher or lower than the switch-off point. Positive or negative
values are permissible, depending on the measured variable in question (e.g. mass
flow, totalizer reading).
User input: 5-digit floating-point number, [unit]
Factory setting: 0 [kg/h] or 2 [kg/l] or 200 [°C]
! Note!
• The appropriate unit is taken from the function UNIT VOLUME FLOW (0402)
or UNIT MASS FLOW (0400).
• Only the switch-on point is available for flow direction output (no switch-off
point). If you enter a value not equal to the zero flow (e.g. 5), the difference
between the zero flow and the value entered corresponds to half the
switchover hysteresis.
SWITCH-ON DELAY
MODBUS register:
Relay output 1
Relay output 2
Data type:
Access:
4702
3804
4004
Float
read/write
! Note!
Function is not available unless LIMIT VALUE or FLOW DIRECTION was
selected in the ASSIGN RELAY function (4700).
Use this function to define a delay (0 to 100 seconds) for pull-up (i.e. signal
changes from 0 to 1) of the relay output. The delay starts when the limit value is
reached. The relay output does switch when the delay has timed out and the
switch on condition has been valid over the delay time.
User input: fixed-point number 0.0 to 100.0 s
Factory setting: 0.0 s
Function description
OUTPUTS → RELAY OUTPUT (1 to 2) → CONFIGURATION