ABB 2600T Series Operating Instruction page 77

Digital output (pulse / limit output)
This digital output can be set as a pulse or limit output
(transistor output) by making parameter changes using the
software.
NPN transistor with open collector output
Contact switching capacity
Low-level output voltage
High-level output voltage
Quiescent current
Fig. 50: High and low level (pulse output)
1 High level | 2 Low level
Fig. 51: Edge steepness
10 ... 30 V, maximum 120 mA DC
0 ... 2 V
Maximum 30 V
500 μA
Pulse output
The scaled, electrically isolated pulse output can be used for
flow measurement by means of an external counter.
Pulse output frequency with 100 %
output
Duty cycle
Minimum pulse width
Limit output
The output is set to a static high or low signal when a given
limit is overshot / undershot.
Output function, model 266CXX
The 4 ... 20 mA output signal is not linear; instead, it
corresponds to the compensated flow or fill level.
Output function, model 266JXX
The 4 ... 20 mA output signal corresponds to the differential
pressure, pressure, or temperature, depending on the
configuration.
Output current limits (in accordance with NAMUR
standard)
Overload condition
— Lower limit: 3.8 mA (configurable from 3.8 ... 4 mA)
— Upper limit: 20.5 mA (configurable from 20 ... 21 mA)
Alarm current
— Minimum alarm current: 3.6 mA
(configurable from 3.6 ... 4 mA)
— Maximum alarm current: 21 mA
(configurable from 20 ... 22 mA)
Standard setting: High alarm current (max. alarm current)
Process diagnostics (PILD)
Plugged impulse line detection (PILD) generates a warning via
the HART communication. The device can also be configured
to drive the analog output signal to the "alarm current".
266CRx, 266JRx, 266CSx, 266JSx | OI/266CXX/266JXX/HART-EN Rev. B 77
Maximum 10 kHz
50 % ± 10 % @ 0.1 Hz to 10 kHz
50 μs at 10 kHz, duty cycle 1:1