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Installation manual
CNC 8055
CNC 8055i
8.
INTRODUCTION TO THE PLC
SOFT: V02.2X
PLC Resources
8.1 PLC Resources
Inputs (I)
They are elements that provide the PLC with information on the signals received from the outside.
They are represented by the letter I and there are 512 inputs available.
Outputs (O)
They are elements that let the PLC activate or deactivate the various devices of the electrical cabinet.
These are represented by the letter O and there are 512 outputs available.
Marks (M)
These are elements capable of memorizing in one bit (as if it were an internal relay) the status of
the different internal variables of the CNC (information of the logic outputs received in the
communication between the CNC and the PLC of the CNC) and the status of the different variables
of the PLC, whether these are internal or established by the user. They are represented by the letter
M, and there are 3999 user marks and other special marks.
Registers (R)
These are elements which allow a numerical value to be stored in 32 bits or facilitate CNC-PLC
communication with the Logic CNC inputs and outputs. They are represented by the letter R and
there are 256 user registers and other special registers.
Timers (T)
These are elements which, once activated, alter the status of their output for a specific time (time
constant). They are represented by the letter T, and there are 512 timers.
Counters (C)
They are elements capable of counting up or down a particular number of events. They are
represented by the letter C and there are 256 counters.
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