IAI America E-Con - Manual (Page 95)

87
7.
ASEL, PSEL
and SSEL
6.5 Assignment of I/O Port Numbers and DeviceNet Addresses
ASEL, PSEL and SSEL controllers provide the program mode and positioner mode, but the principles of
how ports and addresses are assigned are the same in both modes. To be specific, I/O port numbers are
assigned in units of 16 points from the channel addresses in the PLC buffer memory corresponding to the
specified node address. Bits in the PLC buffer memory are assigned to the I/O port numbers, starting from
the least significant bit and the youngest port number.
(1) Basic example
The figure below shows the correlation of relevant items when the I/O parameters are set as follows:
No. 16 = 0 (First input port number)
No. 17 = 300 (First output port number)
No. 14 = No. 15 = 16 (Numbers of input/output ports)
No. 266 = nn (Node address)
(Note) NN and MM indicate PLC channel addresses corresponding to node address nn.
Node addresses nn, nn+1, nn+2, and so on, are occupied according to the numbers of
input/output points used. Accordingly, exercise caution to avoid node address duplication.
Input port number
(Bit address)
PLC output buffer memory
Bit position Channel
address
PLC input buffer memory
Bit position
Output port number
(Bit address)
7.5