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9 - 18
MELSEC-F
WHEN COMMUNICATING DATA USING THE MC PROTOCOL9
9 - 18
POINT
(1) Bit devices and word devices are classified according to the following.
Bit devices : X, Y, M, S, T (contact), C (contact)
Word devices : T (current value), C (current value), D, R
(2) When word units are designated, always make the head device number of a
bit device a multiple of 16 (0, 16... in decimal representation).
For X and Y is expressed in octadecimal, the device numbers that can be
designated are X00, X20, X40,,, or Y00, Y20, Y40,,,.
Also, special M relays M8000 or later can be specified (8000 + multiples of
16).
(3) The special relays (M8000 to M8511) and special registers (D8000 to D8511)
are divided into read only, write only and system use registers.
If writing takes place outside the writing enabled range, a PLC error may
occur.
See the Programming Manual for detailed descriptions of the special relays
and the special registers.