The relay and data of the CPM l A series PLC are divided into the internal relay area (1R), the special auxiliary relay area (SR), the temporary relay area (TR), the relay area (HR), the auxiliary memory relay area (AR), the link Relay area (LR), timer / counter area (TC) and data storage (DM).

The internal devices of the CPM l A series PLC are numbered in channel form and the channel number is indicated by two, three or four digits. There are 16 relays in a channel, one for the relay and one for the 16 bits. So the number of a relay consists of two parts, part of the channel number, the other part of the relay in the channel bit number.

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