451 series
6
5 6
451
451
451
451
series
series
series
series
module
module
module
module
3.4.5 "Multi-Input"
In the "Multi-input"
option,
the module inputs must be connected in series.
To protect the 451 series module inputs (which are in the
low impedance
"Multi-input"
option), two types of connection can be made.
The inputs must be connected either in series with a unit at the standard input, or in series
with an equivalent resistor.
• Connection with a
protection resistance R ,
which must be placed in series
on the control signal
Multi-inputs
Logic signal
from 15 to 28 V
(6 mA min)
O
T
Figure 3.2 Wiring diagram of "Multi-input" option with resistor
The value R of this resistance in kl2 is:
R = (V - 2.5 N) / 6
V : control signal voltage
N : number of units placed in series.
R must correspond to R/N > 50 S2 .
The resistor must be able to dissipate I W.
451-461 User Manual
3-9
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