Chapter 4 CPU Specifications
XBC E-Type Main Unit 4-11 Ver. 1
4.5.2 Classifications of devices
Devices are classified into bit device and word device, based on expression method and operand processing
method.
1. Bit device
a. Available to express the bit without a ‘.’ (dot) when used in basic instructions as LOAD
or OUT.
b. P, M, K, F, T (bit contact), C (bit contact), L, S
c. If index function is used in bit device, it indicates the bit with the bit position to which
index register’s value is added. However, if bit device is used in application instruction
and the instruction’s operand is of word data, its operation will be in word.
d. Example) LOAD P00001[Z1] If Z1=8, LOAD P(1+8) = LOAD P00009
MOV P00001[Z1] D10 If Z1=8, MOV P00009 D00010
4.5.3 I/O P
I/O P, as the area equivalent to external equipment is composed of push button used as input device, input
section to receive signals of switch or limit switch, solenoid used as output device, and output section to deliver
operation result to motor and lamp.
For input section P, since input status is kept in PLC’s internal memory, contact A and B are available to use.
For output section P, contact A and B are also available. Other sections than used for I/O in P area can be used
just like the auxiliary relay M. According to instructions applied, it can be used in word unit.
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