Table of Contents
Advertisement
Processing details
■LD, LDI
• LD is the A contact operation start instruction, and LDI is the B contact operation start instruction. They read ON/OFF
information from the designated device
*1 When a bit designation is made for a word device, the device turns ON or OFF depending on the 1/0 status of the designated bit.
■AND, ANI
• AND is the A contact series connection instruction, and ANI is the B contact series connection instruction. They read the
ON/OFF data of the designated bit device
and take this value as the operation result.
*1 When a bit designation is made for a word device, the device turns ON or OFF depending on the 1/0 status of the designated bit.
• There are no restrictions on the use of AND or ANI, but the following applies in the ladder mode of a programming tool:
Item
Write
Read
■OR, ORI
• OR is the A contact single parallel connection instruction, and ORI is the B contact single parallel connection instruction.
They read ON/OFF information from the designated device
that point, and use the resulting value as the operation result.
*1 When a bit designation is made for a word device, the device turns ON or OFF depending on the 1/0 status of the designated bit.
• There are no limits on the use of OR or ORI, but the following applies in the ladder mode of a programming tool:
Item
Write
Read
Word device bit designations are made in hexadecimal.
Bit b11 of D0 would be D0.0B.
See Page 82 Using bit data for more information on word device bit designation.
Operation error
• There is no operation error in the LD, LDI, AND, ANI, OR, or ORI instruction.
Program example
• A program using the LD, AND, OR, and ORI instructions.
[Ladder Mode]
b15
D0
5 SEQUENCE INSTRUCTIONS
132
5.1 Contact Instructions
*1
, and use that as an operation result.
*2
, perform an AND operation on that data and the operation result to that point,
Description
When AND and ANI are connected in series, a ladder with up to 24 stages can be displayed.
When AND and ANI are connected in series, a ladder with up to 24 stages can be displayed. If the number exceeds 24 stages, up to
24 will be displayed.
Description
OR and ORI can be used to create connections of up to 23 ladders.
OR and ORI can be used to create connections of up to 23 ladders. The 24th or subsequent ladders cannot be displayed properly.
b5
b0
1
0
*1
, and perform an OR operation with the operation results to
[List Mode]
Step
Instruction
Device
Bit designated
for word
device
Advertisement
Table of Contents
