1640-IN-031-C-08
Page 90 of 104
Eurotherm/Barber-Colman
MACO Series Controller Installation
15. Wiring the 32 In/32 Out or 24 In/24 Out Digital I/O Boards
15.1 Introduction
The 32 In/32 Out Digital I/O board is capable of (both) 32 inputs and 32 outputs.
Outputs are sourced in groups of 4, with Vcc 1-4 supplying Output 1 through Output
4, Vcc 5-8 supplying Output 5 through 8, etc.
Each output circuit is thermally and over-current protected. Output groups need to
be externally fused. The size of the fuse must be determined based on actual load
usage, power supply and wire size.
15.2 Specifications
Power Supply
Power must come from a Class 2 power supply, 18 to 32 Vdc.
Outputs
Outputs are rated for 2 Amp loads at 24 Vdc. Maximum leakage current is 1 mA.
At 55°C ambient and 24 Vdc, these outputs MUST be limited to 2 Amps maximum
per output, 8 Amps maximum per group and 64 Amps maximum per card (48 Amps
for the 24 In/24 Out version).
Inputs
Inputs represent a 3 mA load, with a guaranteed turn on voltage of 16 Vdc and a
guaranteed turn off voltage of 5 Vdc.
Class 2 Wiring must be separated a minimum of
1/4 inch from any Class 1 conductors.
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