5 SEQUENCE INSTRUCTIONS
5.1 Contact Instructions
161
5
■Description, range, data type
• In safety programs executed by the Safety CPU, only safety devices and safety labels of data types described in the table
can be used.
■Applicable devices
• In safety programs executed by the Safety CPU, only the following safety devices and constants can be used.
■LD, LDI
• LD is a normally open contact operation start instruction and LDI is a normally closed contact operation start instruction.
These instructions read the on/off information
*1
of the specified bit device, and output it as the operation result.
*1 When a bit of a word device is specified, the instruction outputs on or off according to the status (1 or 0) of the specified bit.
■AND, ANI
• AND is a normally open contact series connection instruction and ANI is a normally closed contact series connection
instruction. These instructions read the on/off information
*1
of the specified bit device, perform an AND operation with the
previous operation result, and output the operation result.
*1 When a bit of a word device is specified, the instruction outputs on or off according to the status (1 or 0) of the specified bit.
• Note the following when creating or displaying a program using the engineering tool (in ladder edit mode).
■OR, ORI
• OR is a single normally open contact parallel connection instruction and ORI is a single normally open contact parallel
connection instruction. These instructions read the on/off information
*1
of the specified bit device, perform an OR operation
with the previous operation result, and output the operation result.
*1 When a bit of a word device is specified, the instruction outputs on or off according to the status (1 or 0) of the specified bit.
• Note the following when creating or displaying a program using the engineering tool (in ladder edit mode).
• Specify a bit in a word device in hexadecimal. (For example, specify "D0.0B" for b11 in D0.)
There is no operation error.
Operand Description Range Data type Data type (label)
(s) Device used as a contact Bit ANY_BOOL
Operand Bit Word Double word Indirect
specification
Constant Others
(DX)
X, Y, M, L,
SM, F, B, SB,
FX, FY
J\ T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
U\G, J\,
U3E\(H)G
Z LT, LS T,
LC
LZ K, H E $
(s)
Operand Bit Word Constant
SA\X, SA\Y, SA\M, SA\SM, SA\B SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD K, H
(s)
• Write mode: When the AND and ANI instructions are connected in series, a ladder with up to 24 steps can be created.
• Read mode: When the AND and ANI instructions are connected in series, a ladder with up to 24 steps can be displayed. If there are more than 24 steps, up
to 24 steps are displayed.
• Write mode: Up to 23 OR and ORI instructions can be connected consecutively.
• Read mode: Up to 23 OR and ORI instructions connected consecutively can be displayed. A ladder with more than 23 instructions cannot be displayed
correctly.
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