Yes. Most of the CPU’s IO can be increased by the addition of expansion units. The exception to this are the PR-6 and PR-12 CPU’s, which are not expandable.
NOTE: The Economy 6-series and Standard 12-series CPU’s can not be expanded! For the ELC-18, ELC-22, ELC-26, PR-12, PR-14, PR-18, PR-24 and PR-26 CPU’s then you would use the expansion modules whose part number begins ELC-E- and/or PR-E-. For the EXM and ELC-12 Ethernet CPU’s, you require the expansion modules whose part number begins ELC12-ERead More
CPU’s that are expanded by using the PR-E Series expansion units can have a maximum of 16 expansion units per CPU. CPU’s that are expanded by using the EXM-E Series expansion units can have a maximum of 8 expansion units per CPU.
By default every expansion unit out of the box has an ID of 1. The ID can be changed by changing the DIP Switches hidden under a plastic cover on the side of the expansion unit.
NOTE: All expansion unit addresses MUST be UNIQUE and MUST be set before applying supply to connected CPU! Don’t panic, there’s nothing wrong! By default the EXM and ELC-12 Ethernet CPU’s have their COM ports configured for an RS485 expansion unit. To enable the CPU to use EXM-E expansion units you need to enable theRead More
No. It does not matter which order you connect the expansion units to the CPU. All that matters is they must have unique ID settings.
Yes. AC powered expansion units can be connected to DC powered CPU’s and vice versa. Power to ALL units MUST be turned on at the same time otherwise communication issues may arise. When expansion units are connected correctly to the CPU, their LED will be Green.
Yes, and vice versa.
When the LED of an expansion unit flashes Red it means that it is unable to communicate correctly with the CPU. Please check connections are securely fitted and that each expansion has a unique ID. Check also that the CPU’s COM port is Active.