| 구분 | SHDDC-E1 | SHDDC-E2 |
| 입력전원 | 24V AC/DC (DC기준 최소 1.0A) | 24V AC/DC (DC기준 최소 1.0A) |
| MCU | 32bit RISC | 32bit RISC |
| 통신 | 1ch RS-485 (메인연동용), 1ch (spare) | 1ch RS-485 (메인연동용), 4ch (spare) |
| DI | 8points (24V DC Source) | 2points (24V DC Source) |
| DO | 8points (Relay Dry Contact) | 2points (Relay Dry Contact) |
| AI | 2ch (PT100 / 0-10V / 0-20mA) | 2ch (PT100 / 0-10V / 0-20mA) |
| AO | 1ch (0-10V / 0-20mA) | 4ch (0-10V / 0-20mA) |