Eurotherm T2550 Redundant Unit Controller

Digital Input Module

2500M/DI4 - Four channel digital input
This digital input module accepts four logic inputs, and may be wired either for voltage input (either polarity) or for contact closure.

No of channels	4
Input functions	On/Off, pulse and de-bounce
System isolation	Reinforced, 264V ac
Channel isolation	Channels share a common connection
Current consumption	100mA max
Contact� Variant
External supply	18-30V dc wetting power required
Contact closure ON state:	Input resistance threshold 100Ω (<1kΩ typical)
OFF state:	Input resistance threshold 10kΩ (>7kΩ typical)
Wetting current	>8mA
Wetting voltage	>9V, 12V typical measured open-circuit
Logic� Variant
Logic inputs ON state:	Input voltage threshold 10.8V dc, 30V max
OFF state:	Input voltage threshold 5.0V dc non-overlapping
Input impedance	4kΩ approx (at least 2mA drive required for �ON�)

2500M/DI8 - Eight channel logic input

This eight channel digital input module accepts eight logic inputs and is available in two factory option formats for voltage or contact-closure input.

No of channels	8
Input functions	On/Off. pulse and de-bounce inputs with input invert
System isolation	Reinforced, 264V ac max
Channel isolation	50V ac functional isolation between 4 pairs of channels
Current consumption	100mA max
�Contact� Variant
Contact closure ON state:	Input resistance threshold 100Ω (<1kΩ typical)
OFF state:	Input resistance threshold 10kΩ (>7kΩ typical)
Wetting current	4mA typical
Wetting voltage	>9V, 12V typical, measured open-circuit
�Logic� Variant
Logic inputs ON state:	Input Voltage threshold 10.8V dc, 30V max
OFF state:	Input Voltage threshold 5.0V dc non-overlapping
Input impedance	5kΩ approx (>2mA drive required for �ON�)

2500M/DI6 - Six channel AC voltage input

The six channel digital input module accepts AC voltage inputs and is available in two factory options optimized for 115V ac or 230V ac ranges.

No of channels

Input functions

On/Off or de-bounce

Frequency

47Hz-63Hz

Transient immunity

EN50082

System isolation

Reinforced, 264V ac max

Channel isolation

Functional, 264V ac max

Current consumption

100mA max

115V ac� Variant

Active On state

>95V ac rms, 132V ac rms max

Inactive OFF state

<30V ac rms

Main input current

More than 2mA required for �ON�

Max input current

8mA

230V ac� Variant

Active ON state

>180V ac rms, 264V ac rms max

Inactive OFF state

<60V ac rms

Min input current

More than 2mA required for �ON�

Max input current

8mA