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model 2704 controller installation and operation handbook - Soliton

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<strong>2704</strong> Controller Installation<br />

2.3.5. I/O Exp<strong>and</strong>er (or Additional Digital Input)<br />

The I/O exp<strong>and</strong>er is used with the <strong>2704</strong> to allow the number of I/O points to be increased by<br />

a further 20 digital inputs <strong>and</strong> 20 digital outputs. Data transfer is performed serially via a two<br />

wire interface from instrument to exp<strong>and</strong>er.<br />

If the exp<strong>and</strong>er unit is not required it is possible to use terminals E1 & E2 as a secondary<br />

digital input. These terminals are not part of the digital I/O on terminals D1 to D8 <strong>and</strong> if used<br />

in this way connect a 2K2, ¼ W limiting resistor in series with the input, as shown in Figure<br />

2-8.<br />

I/O exp<strong>and</strong>er connections<br />

E1<br />

E2<br />

Data<br />

transfer<br />

ƒ<br />

20 Inputs<br />

Exp<strong>and</strong>er<br />

20 Outputs<br />

…<br />

I/O exp<strong>and</strong>er connections<br />

E1<br />

E2<br />

Additional digital input if the<br />

exp<strong>and</strong>er is not used<br />

2K2<br />

+<br />

-<br />

Limits:<br />

-1V, +35V<br />

Figure 2-8: Wiring Connections for the I/O Exp<strong>and</strong>er<br />

Installation <strong>and</strong> Operation H<strong>and</strong>book. Part No HA026502 Issue 1.0 Apr-00 2-9

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