Sealevel 170POE Overview

Table of Contents

1. Overview

2. Hardware Limits & Recommendations

   1. Analog Inputs

   2. Optically‑Isolated Digital Inputs

   3. Power Options & PoE

3. Wiring Examples

   1. Current Transducer → Analog Input

   2. Chuck Open Contact → Opto Input

4. Adapter Script Templates

5. Troubleshooting Checklist

6. Key Specs

Overview

The Sealevel 170PoE is a compact, Ethernet-based analog input module that provides remote data acquisition over Modbus TCP. Powered via PoE, it offers eight 12-bit analog inputs and is ideal for industrial monitoring and control applications.

Sealevel adapter scripts are written in YAML and form the bridge between physical hardware (eI/O modules) and the MachineMetrics platform. This guide focuses on the eI/O‑170 family and adds practical engineering limits, wiring best practices, and concise examples you can copy‑paste into your own scripts.

Quick‑Start: Jump straight to the wiring examples if you already know the basics.

Hardware Limits & Recommendations

Analog Inputs

Best practices

• Scale any 4‑20 mA loops with a precision 250 Ω resistor (1%, 0.25 W) to create a 1‑5 V span in the 0‑5 V range.

• To maximize resolution, pick the smallest range that envelopes your signal.

• Leave a small head‑room (≈5 %) under 5 V or 10 V to avoid clipping during transients.

• Shielded twisted‑pair recommended for runs >3 ft; tie shield to earth at one end only.

Optically‑Isolated Digital Inputs

Best practices

1. Use a relay (form‑A reed is fine) when tapping into PLC points >30 V or when potential transients exist.

2. For proximity sensors that provide NPN open‑collector outputs, tie the collector to the input and emitter to common.

3. Avoid directly driving the opto input with external supply; it adds ground loops and wastes the built‑in current source.

Power Options & PoE

Tips

• Keep CAT‑5e/6 cables <100 m and shielded if running inside panels with VFD noise.

• For tight cabinets, a mid‑span PoE injector avoids rewiring the switch.

• Budget ~7 W per port on the PoE switch to be safe (switches round up power classes).

Wiring Examples

Current Transducer → Analog Input

24 Vdc SUPPLY ──┬───────────────────────────────┐
                │                               │
                │ (+)                           │
            [Current Tx]                       eI/O‑170  (Single‑Ended mode)
            0‑10 V OUT ──────────────────────── pin 1  (analog_in0)
            GND      ────────────────────────── pin 9  (AGND)
                │
                └─ Shield (if present) ─── Chassis

•  

  If your transducer outputs 4‑20 mA, place a 250 Ω resistor across pin 1‑9 and set range to 0‑5 V.

• Keep analog pair separate from motor leads; twists at least 4 turns/ft.

Chuck Open Contact → Opto Input

          MACHINE PLC / RELAY CARD

          (24 V dry‑contact example)

   +24 V ──┐

            │  Chuck‑Open N.O. Contact

   0 V ──┐  │

          │  └─────┐                

          │        │   eI/O‑170

          │        ├── pin 11 (COM)

          └────────┴── pin 10 (opt‑0)

•  

  If the machine contact switches a higher voltage or unknown source, interpose a reed relay: coil on machine side, contacts wired as above.

• Opto inputs are polarity‑agnostic—either pin can be common.

Adapter Script Templates

Template 1 – Current Transducer + Execution State

version: 2
unit-id: 1
registers:
  analog_in0:
    address: 0
    func: 4
    type: uint16
coils:
  chuck_open:
    address: 0
    func: 2
  part_count_input: 
    address: 1 
    func: 2
variables:
  # 0‑10 V ➜ kW (example scaling)
  spindle_power_kw:
    - source: analog_in0 / 409.6 * 5   # 0‑10 V to 0‑5 kW
  execution:
    - source: spindle_power_kw > 0.2
    - state:
        - ACTIVE: this
        - READY: true
  chuck_state:
    - source: chuck_open
    - state:
        - OPEN: this
        - CLOSED: true
  part_count:
    - source: part_count_input
    - rising-edge
    - count
data-items:
  - execution
  - part_count
  - spindle_power_kw
  - chuck_state

Template 2 – Part Counter with Relay Isolation

version: 2
unit-id: 1
coils:
  part_sensor:
    address: 1
    func: 2
variables:
  part-count:
    - source: part_sensor
    - rising-edge
    - count
  speed_ppm:
    - source: part-count
    - window-count: 60

data-items:
  - part-count
  - speed_ppm

Troubleshooting Checklist

1. Analog reads zero ➜ Check range, loose common, or sensor supply.

2. Opto input stuck ON ➜ Measure contact for leakage (<1 mA). Add relay isolation.

3. No PoE ➜ Verify port delivers ~48 V under load; CAT‑5e pinout correct.

4. Script won’t load ➜ Validate YAML, ensure version: 2 and correct indent.

Appendix A – Key Specs

eI/O‑170 (excerpt)

• Analog Inputs: 8 SE / 4 DIFF, ±10 V max, 12‑bit, 100 kΩ

• Opto Inputs: 2 × dry‑contact, 12 mA source, 1 kV isolation

• Relay Outputs: 2 × SPST solid‑state, 60 V DC @ 2.5 A max

• Power: 9‑30 V DC (≤5 W) or PoE 802.3af‑2003 Class 0 (≤3.5 W)