Installing Interface Port Accessories

Install EXO interface port accessories as shown in the following electrical diagrams to ensure intrinsic safety.

Table 1. Interface port parameters – Low-side switch

Table 2. Input entity parameters (low-side switch)
Terminal	Ui	Ii	Pi	Ci	Li
Pin 1 to pin 2 (GND)	24Vdc	3.33A	1.25W	0F	0H

Table 3. Interface port parameters – pins 3 & 4

Table 4. Output entity parameters
Terminal	Uo	Io	Po	Co	Lo	Lo/Ro*
Pin 3 to pin 2 (GND)	20.76Vdc	93mA	0.479W	0.194uF	4.1mH	18.2uH/Ω
Pin 4 to pin 2 (GND)	3.6Vdc	1.21A	3W	1000uF	24.3uH	21.9uH/Ω

* Li may be greater than Lo and the cable length restrictions due to cable inductance (Lcable),

and can be ignored if both of the following conditions are met:

Lo/Ro ≥ Li/Ri

Lo/Ro ≥ Lcable/Rcable

Table 5. Interface port functional parameters

^†Io and Po is reduced if both pin 3 and pin 4 are used simultaneously.

Table 7. Functional input parameters (low-side switch) for interface ports A and B
Terminal	Ui	Ii	Pi	Ci	Li
Pin 1 to pin 2 (GND)	24Vdc	3.33A	1.25W	0F	0H

Table 8. Interface port functional parameters with barriers

Note:

A barrier is required for each interface port. The diode barrier and dual barrier can be individual units or a joint unit.

^†Io and Po is reduced if both pin 3 and pin 4 are used simultaneously.

Table 10. Functional input parameters (low side switch) for interface ports A and B
Terminal	Ui	Ii	Pi	Ci	Li
Pin 1 to pin 2 (GND)	24Vdc	3.33A	1.25W	0F	0H

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