ZEN Programmable Relays: How are I/O bits allocated?
Inputs I0 to I5 and outputs Q0 to Q3 are allocated for 10-point CPU Units. For Communications-type CPU Units, however, external outputs are not possible for Q3.
Inputs I0 to Ib and outputs Q0 to Q7 are allocated for 20-point CPU Units.
If Expansion I/O Units are connecting, inputs are allocated from X0 and outputs are allocated from Y0 in order starting from the Expansion I/O Unit on the left. Inputs are allocated through Xb and outputs are allocated through Yb.