Yes – If you are using expansion units (EXM-E-) with your GSM CPU then you cannot use EXM-E-RS485 as well. If you require RS485 on your GSM CPU system, then please choose the PRO-RS485, which plugs into the programming port of the PLC CPU. If you are not using ANY other expansion units with your […]
Read MoreFAQ Category: Expansion Units
The Expansion Units LED’s are Flashing Red. What’s the Problem?
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 (see above).
Read MoreCan Analogue Expansion Units be Added to Digital CPU?
Yes, and vice versa.
Read MoreI have an AC expansion unit. Can I connect this to my DC powered CPU?
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.
Read MoreOnce expansion unit ID’s are set, do they need to be connected in order?
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.
Read MoreI have changed the ID of my EXM-E expansion unit but the CPU won’t communicate. What’s wrong?
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 the […]
Read MoreHow do you change an expansion units ID?
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.
Read MoreHow many expansion units can be added to a CPU?
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.
Read MoreWhich expansion units work with which PLC CPU’s?
NOTE: The Economy 6-series and Standard 12-series CPU’s can not be expanded! For the ELC-18, ELC-22, ELC-26, PR-18 and PR-24 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-E and/or EXM-E-.
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