Wiring 10 — Industrial Ethernet (EtherNet/IP)
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Briefing
EtherNet/IP (CIP over Ethernet) is the dominant industrial Ethernet protocol in North America. Unlike office Ethernet, **industrial Ethernet** requires: 1. **Shielded twisted-pair (STP/FTP)** cable — Cat 5e minimum, Cat 6 preferred. 2. **Cable shield grounded at one end** (typically the panel/switch end) to prevent ground loops. 3. **Managed switches** for device-level ring (DLR) fault tolerance. 4. **IP addressing plan**: PLC, scanner, and target devices all need unique static IPs. Wire the PLC, Inverter 1, and a remote I/O block to a managed switch.
Objectives
- Wire PLC Ethernet port to switch port 1
- Wire Inverter 1 Ethernet port to switch port 2
- Wire remote I/O to switch port 3
- Bond cable shields to panel earth at switch end
Hints
- Industrial Ethernet switches should be DIN-rail mounted with 24 VDC supply, not POE switches.
- Shield the cables — unshielded Cat 5e near VFDs picks up EMI noise and causes CIP timeouts.
I/O Table
Inputs
PLC_ETHPLC Ethernet port → switch port 1
BOOL · %I0.0
VFD_ETHInverter 1 Ethernet → switch port 2
BOOL · %I0.1
REMOTE_IORemote I/O block → switch port 3
BOOL · %I0.2
SHIELD_GNDCable shield bond to panel earth (switch end)
BOOL · %I0.3
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