Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

Page: 1189 / 2110

11 PROCESS CONTROL INSTRUCTIONS
11.1 Overview
1187
11
Input data
Input data is variable data given to each process control instruction. The block word (BW) in the block memory in which the
operation result of the previous process control instruction is stored is used as input data.
*1 For the block memory, refer to the following.

Page 1187 Block memory
The application of input data varies depending on the instruction used. Refer to the descriptions of individual instructions.
Block memory
The block memory is an area in which the output information of each process control instruction is stored.
The block memory consists of a block word (BW) and a block bit (BB).
•
 Page 1187 Block word (BW)
•  Page 1187 Block bit (BB)
The application of block memory varies depending on the instruction used. Refer to the descriptions of individual instructions.
■
Block word (BW)
The block word (BW) is an area in which the operation result of each process control instruction is stored. The data stored in
the block word (BW) is specified for the input data for the next process control instruction connected by the loop.
■
Block bit (BB)
The block bit (BB) is an area in which alarm data during execution of each process control instruction is stored. Sixteen bits
from b0 to b15 are represented as BB1 to BB16. If an alarm occurs in any of b1 to b15 (BB2 to BB16) used by instructions, 1
is stored in b0 (BB1). The bits that are not used are cleared to zero.
(1) When storing a real number in the block word, use two words.
(2) The block bit is used by setting each bit of one word to on or off.
S.IN S.PHPL
Process control instruction Process control instruction
Operation result Operation result
Input data
Input data Block word Block word
Block bit Block bit
Transferred by user
Block memory
*1
+0
+1
+2
(1)
(2)
Specified device number
Block memory
Block word (2 words)
Block bit
S.IN S.PHPL
Process control instruction
Process control instruction
Operation result
Operation result
Input data
Input data
Block word Block word
Block bit Block bit
Transferred by user
b15b14b13b12 b8 b4 b0 b1 b2 b3 b5 b6 b7 b9 b10 b11
BB3 BB4 BB5 BB6 BB7 BB8 BB9 BB10 BB11 BB12 BB13 BB14 BB15 BB16 BB2 BB1