The 4-channel IM1-451EX-R isolating switching amplifier is equipped with intrinsically safe
input circuits.
Sensors according to EN 60947-5-6 (NAMUR)
or potential-free contact transmitters can be
connected to the device.
The output circuits each feature a relay with
an NO contact. In addition, the device features
a common alarm output.

Via eight switches on the front, the output
mode (work or quiescent current behavior, i.e.
NO/NC) can be switched on and off separately for each channel as well as wire-break (WB)
and short-circuit monitoring (SC).
When using mechanical contacts, wire-break
and short-circuit monitoring must be switched
off or the contacts must be wired to resistors
(II) (see circuit diagram).
The Pwr LED lights green to indicate operational readiness. The 2-color LED 1 lights yellow to indicate the switching status of the output. In the event of an input circuit error, the 2-
color LED turns red, with the input circuit monitoring switched on. Thereupon the output and
the alarm relay drop out.

■ 5 relay outputs (NO)
■ Output mode adjustable (NO/NC mode)
■ Input circuits monitored for wire-break/
short-circuit (ON/OFF switchable)
■ Common alarm output
■ Complete galvanic isolation
■ Input reverse-polarity protected
■ ATEX, IECEx, UL, CFMUS, CSA, TR CU, INMETRO, TIIS, NEPSI
■ Installation in zone 2