22
Models FL3100H/3101H
3.3.6 Analog
Output
The 0 to 20 mA output is a current signal that corresponds to the following signals:
Condition
Current Modbus
HART (Normal)
HART (Special)
START UP:
0 to 0.2 mA
3.5 ± 0.1 mA
1.25 ± 0.1 mA
FAULT:
0 to 0.2 mA
3.5 ± 0.1 mA
1.25 ± 0.1 mA
COPM Fault:
2.0 ± 0.1 mA
3.5 ± 0.1 mA
2.0 ± 0.1 mA
Ready:
4.05 ± 0.05 mA
4.05 ± 0.05 mA
4.05 ± 0.05 mA
IR (FL3100H only):
8.0 ± 0.1 mA
8.0 ± 0.1 mA
8.0 ± 0.1 mA
UV (FL3100H only):
12.0 ± 0.1 mA
12.0 ± 0.1 mA
12.0 ± 0.1 mA
WARN:
16.0 ± 0.1 mA
16.0 ± 0.1 mA
16.0 ± 0.1 mA
ALARM:
20.0 ± 0.1 mA
20.0 ± 0.1 mA
20.0 ± 0.1 mA
When HART is selected, the output current changes to comply with the HART Foundation
requirements. The HART Foundation does not specify current below 3.5 mA. In normal HART
mode, the actual current does not go below 3.5 mA. Modbus reports the analog output as if
HART was not there, meaning it reports 2.0 mA for COPM. This allows users to use a constant
Modbus program. The digital HART reports the actual current. When the alarm or warning
relays are latched, the highest output current is also latched. The output current will return to
4.0 mA after the relay reset is activated via Modbus, HART, or remote switch.
The HART special mode allows the current to go down to 1.25 mA. The HART will still function.
This mode must be used with GMI’s products that rely on 2 mA output for COPM and 1.5 for
offline and zero for fault (TA402A).
NOTE:
The maximum analog output load is 600 Ohms, including wiring.
3.3.7 Cable
Requirements
For interfacing with 250 Ohm input impedance devices, the following maximum cable lengths
apply (maximum 50-Ohm loop):
Cable
AWG
Run
Feet
Cable
mm
2
Run
Meters
14 9000 2.50 2750
16
5800
1.50
1770
18 3800 1.00 1160
20
2400
0.75
730
22 1700 0.50 520
Table 5: Maximum Cable Requirements
Summary of Contents for FL3101H
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Page 22: ...Models FL3100H 3101H 15 Figure 14 P N 71072 Rear View Mounting Bracket Drawing ...
Page 70: ...63 Models FL3100H 3101H 10 7 Final Assembly Figure 24 P N 71450 FL3100H UV IR Final Assembly ...
Page 71: ...Models FL3100H 3101H 64 Figure 25 P N 71451 FL3101H UV Final Assembly ...