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Limit Alarm Unit DG 35200

Monitoring of analog standard signals

The configurable Limit Alarm Switch DG 35200 is used for limit monitoring and processing of unipolar and bipolar standard signals. A SPST relay or optionally an isolated, passive transistor switch (Open-Collector) is available at the output.

  • Universal input for current and voltage
    and integrated transmitter supply
  • Easy configurable via DIP switches or via USB
    limit point, hysteresis and mode of operation can be directly set, limit point adjust also in operation via teach-in function
  • Switchable timer and special functions
    Switch-on delay, switch-off delay and wiper function, Memory and window functions
  • 3-Port-Separation
    protection against switching errors due to parasitic voltages or ground loops
  • Extremely slim design
    6.2 mm slim housing for a simple and space saving DIN rail mounting
  • Optional In-Rail-Bus mounting rail connector
    allows for fast and economical installation
  • Protective Separation acc. to EN 61140
    Protects service personnel and downstream devices against impermissibly high voltage
  • 5 Years Warranty
    Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)

The Limit Alarm Unit monitors standardized current and voltage signals, and transmits the signal to the switching output. A transmitter power supply is provided for the operation of 2-wire and 3-wire transmitters.

The configuration is carried out via DIP switch or USB interface. The switch point can be taught-in and corrected during operation with the front-side Teach-In buttons. The alarm Unit has an adjustable switch-on delay, switch-off delay and a wiper function. Further settings such as memory function and window function can be programmed via USB interface.

The input is protected against polarity reversal and short circuit. The power supply can be provided via the connection terminal blocks or via the optional In-Rail-Bus. The switch status and the device status are indicated by LEDs on front panel. If the device is operated via the In-Rail-Bus, a common fault message is available on the status line.

Product line

Product line DG 35200
Device Type Order No.
Limit Alarm Unit, Relay, configurable per DIP switch DG 35200 S
Limit Alarm Unit, Relay, configurable per DIP switch,
In-Rail-Bus for power supply and group message
DG 35200 B
Limit Alarm Unit, Transistor, configurable per DIP switch DG 35280 S
Limit Alarm Unit, Transistor, configurable per DIP switch,
In-Rail-Bus for power supply and group message
DG 35280 B

Technical Data


  Current Voltage
Input signal 0 to 20 mA, 4 to 20 mA, ± 20 mA
0 to 10 mA, 2 to 10 mA, ±10 mA
ABS 20 mA
4 to 20 mA/NE43 (Relay inactive outside
the NAMUR range 3.6 to 22 mA)
0 to 10 V, 2 to 10 V, ± 10 V
0 to 5 V, 1 to 5 V, ±5 V
ABS 10 V
Input resistance ≤ 20 Ω ≥ 1 MΩ
Overload < 50 mA < 30 V
Transmitter supply (Tx) 16 V (open circuit voltage/short circuit current < 22 V/35 mA)


DG 35200 (Relay): 250 V AC / 30 V DC / 2 A, Recommended minimum load 300 mW / 5 V / 5 mA
DG 35280 (Transistor): 36 V DC / 50 mA, galvanically isolated, not current limited
Resonse time ≤ 20 ms
Switching functions
Make / break contact,
ON delay, OFF delay or wiper: OFF, 0.5 s, 1 s, 5 s, 10 s
Common fault message Signal on In-Rail-Bus E (supply circuit) at device failure, cable break und short circuit

General Data

Testvoltage 3 kV AC, 50 Hz, 1 Min., Input against output against power supply/In-Rail-Bus
Working voltage1)
(Basic Insulation)
600 V AC/DC for overvoltage category II and pollution degree 2
acc. to EN 61010-1

Protection against electrical shock1)

Protective separation according to EN 61140 by reinforced insulation
in accordance with EN 61010-1 up to 300 V AC/DC for overvoltage
category II and pollution degree 2 between all circuits
Ambient temperature Operation
Transport and storage
–25 °C to +70 °C  (-13 to +158 °F)
–40 °C to +85 °C  (-40 to +185 °F)
Power supply 24 V DC, voltage range 16.8 V to 31.2 V DC, max. 1.0 W
EMC2) EN 61326-1
Approvals (pending) UL (USA/Kanada),     UL 61010, Class I, Div. 2
ATEX / IECEx,     Zone 2 (nA)
Construction 6.2 mm (0.244") housing, protection class IP 20,
mounting on 35 mm DIN rail acc. to EN 60715
Connection Captive plus-minus clamp screws
Wire cross-section 0.5 to 2.5 mm2 / AWG 20-14
Stripped length 8 mm / 0.3 in
Screw terminal torque 0.6 Nm / 5 lbf in
Weight Approx. 70 g
  1. For applications with high working voltages, ensure there is sufficient spacing or isolation from neighboring devices and protection against electric shocks.
  2. Minor deviations possible during interference

Block diagram


Terminal assignments

  • 1 + Transmitter supply
  • 2 + Current input
  • 3 − GND
  • 4 + Voltage input
  • 5 Relay
  • 6 Relay
  • 5 + Transistor output
  • 6 − Transistor output
  • 7 + Power supply 24 V DC
    (connected to In-Rail-Bus)
  • 8 − Power supply 24 V DC
    (connected to In-Rail-Bus)

Optional power connection via In-Rail-Bus (see accessories)

Subject to change!

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