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Appendix B - Discrete Gateway Module (DGM) Connection Details
3A2098H 119
DGM Digital Input
The digital inputs function only when power is supplied to pin 51 and there is a ground connection to pin 70. See Pin
References, page 118, for details. The digital input is rated at 0-30 Vdc, and requires an NEC Class 2 power supply
connected to pin 51. The DGM provides optical isolation as shown in the following illustration.
• Pins: 52 – 59, 71-78
• Type: Sinking
• Maximum current draw: 3.6 mA
Microcontroller
Discrete Gateway
Customer Automation
Optical
Isolator
Digital Input
Isolated Logic ICs
24VDC
D-Sub Pin 51 (Isolated
Logic Supply)
D-Sub Pin 70
(Isolated Ground)
Microcontroller
Discrete Gateway
Customer Automation
Optical
Isolator
Isolated Logic ICs
24VDC
D-Sub Pin 51 (Isolated
Logic Supply), 10-30 VDC
D-Sub Pin 70
(Isolated Ground)