LSIS XBE-DC08A, Руководство пользователя, Страница: 126 / 1284

M
ain
Chapter 1 Configuration and Operation Mode of Programs
1-29
For holding of retain area data or reset (clear) operation according to PLC operation, refer to the following table.
Classification Retain M area Retain R area
Reset Hold previous value Hold previous value Hold previous value
Overall reset Initialized as ‘0’ Initialized as ‘0’ Hold previous value
STOP→RUN
Hold previous value Hold previous value Hold previous value
Remark
1) Terms on three types of variable are as follows.
(1) Default variable : variable not set as INIT or Retain variable
(2) INIT variable : initial value is set
(3) Retain variable : Holds previous value
(3)Initialization of data
If PLC becomes ‘Clear Memory’ status, memory of all devices are deleted as ‘0’. When you want to specify initial value, use initialization
task. At CPU module, there are two types of built-in memory. One is program memory to save program made by user, for user to
structure system, Another is data memory providing device area saving data during operation.