Description Value
Threshold voltage 16...176 V DC
Ripple in the DC auxiliary voltage Max 15 % of the DC value (at frequency of 100
Hz)
Wetting current
220 mA, impulse period 5ms
0…120 mA
10
, impulse period 8ms
Adjust the binary input threshold voltage correctly. It is recommended
to set the threshold voltage to 70 % of the nominal auxiliary voltage.
The factory default is 16 V to ensure the binary inputs’ operation
regardless of the auxiliary voltage used (24, 48, 60, 110, 125, 220 or 250 V
DC). However, the default value is not optimal for the higher auxiliary
voltages. The binary input threshold voltage should be set as high
as possible to prevent any inadvertent activation of the binary inputs
due to possible external disturbances. At the same time, the threshold
should be set so that the correct operation is not jeopardized in case of
undervoltage of the auxiliary voltage.
Table 1671: RTD/mA inputs and mA outputs
Description Value
RTD inputs Supported RTD sen-
sors
100 Ω platinum
250 Ω platinum
100 Ω nickel
120 Ω nickel
250 Ω nickel
TCR 0.00385 (DIN
43760)
TCR 0.00385
TCR 0.00618 (DIN
43760)
TCR 0.00618
TCR 0.00618
Supported resistance
range
0...4 kΩ
Maximum lead re-
sistance (three-wire
measurement)
100 Ω per lead
Isolation 2 kV (inputs to protective earth)
Response time <1 s
RTD/resistance sens-
ing current
<1 mA rms
Operation accuracy Resistance Temperature
± 2.0 % or ±1 Ω ±1°C
mA inputs Supported current
range
±0…20 mA
Current input impe-
dance
44 Ω ±0.1 %
Operation accuracy ±0.5 % or ±0.01 mA
mA outputs Supported current
range
±0…20 mA
Table continues on the next page
10
Adjustable only in RTD1002 module
1MRS759142 F Technical data
REX640
Technical Manual
1943
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