Semiconductor RO Skid CompactLogix and VFD Controls Upgrade
Migrated a Reverse Osmosis skid from FlexLogix PLCs and ControlNet to CompactLogix PLCs with Ethernet/IP Device Level Ring I/O and hardwired VFD control.
Project Overview
A semiconductor manufacturer's Reverse Osmosis skid was running on three legacy FlexLogix PLC racks communicating over ControlNet. We replaced all three racks with CompactLogix PLCs and updated the programming for the firmware change, preventing issues with oneshot instructions latching in the code.
On each rack, we replaced the ControlNet Point I/O AENTR adapter with an Ethernet/IP model and configured the network in a Device Level Ring (DLR) topology, so losing a single link no longer drops communications to all of the I/O. An ETAP was also installed and configured on each rack.
We converted the ControlNet VFD control to hardwired I/O, running new cable between each CompactLogix rack and its Allen Bradley 1336 PLUS II drive. Each drive board was rewired so the PLC controls start/stop, aux, speed command, speed feedback, HOA, and fault signals.
Technologies Used
- Allen Bradley CompactLogix
- Studio 5000
- Point I/O
- Ethernet/IP
- Device Level Ring
- ControlNet
- Allen Bradley 1336 PLUS II
Category
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