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Question
ZEN Programmable Relays: What is the difference between 8E1 and 4E/8E Expansion I/O Units?
Answer
| Item | ZEN-8E1[] | ZEN-4E[] and ZEN-8E[] | |
| Type | 8 inputs/outputs | 4 inputs, 4 outputs, and 8 inputs/outputs | |
| Shape | Width: 35 mm, no heat dissipation slits | Width: 70 mm | |
| Screw mounting method | M3 (mounting holes on DIN Track) | M4 (holes on Expansion I/O Units) | |
| Power supply | ZEN-8E1AR, -8E1DR: Required. ZEN-8E1DT: Not required. | Not required. | |
| AC input circuits | Input impedance | 680 kΩ | 83 kΩ |
| Isolation method | Not isolated | Photocoupler | |
| Input common | Connected internally to power supply terminal. | Separated as COM terminal. | |
| DC input circuits | Input voltage | 10.8 to 28.8 VDC | 20.4 to 26.4 VDC |
| ON voltage | 8 V | 16 V | |
| Input impedance | 6.5 kΩ | 4.7 kΩ | |
| Isolation method | ZEN-8E1DR: Not isolated ZEN-8E1DT: Photocoupler | Photocoupler | |
| Input common | ZEN-8E1DR: Connected internally to power supply terminal. ZEN-8E1DT: Separated as COM terminal. | Separated as COM terminal. | |
| Contact current for Models with Relay Outputs | 8 A/contact The total for all outputs must be as follows for each Unit: 20 A | 8 A/contact | |
| Maximum voltage for Models with Transistor Outputs | 28.8 VDC | 26.4 VDC | |
| Connectable CPU Units | V2 CPU Units | V1 and Pre-V1 CPU Units | |
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