Mnemonic Function LD Load A contact
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
9 9 9 9 9 －
L The LD command is used on the A contact that has its start from the left BUS or the A contact that is the start of a contact circuit. Function of the command is to save present contents, and at the same time, save the acquired contact status into the accumulative register.
Command code Operation
LD X0 Load contact A of X0 AND X1 Connect to contact A of
X1 in series Example Ladder diagram
X0 X1
Y1
OUT Y1 Drive Y1 coil Mnemonic Function
LDI Load B contact
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
9 9 9 9 9 －
The LDI command is used on the B contact that has its start from the left BUS or the B contact that is the start of a contact circuit. Function of the command is to save present contents, and at the same time, save the acquired contact status into the accumulative register.
Command code: Operation:
LDI X0 Load contact B of X0 AND X1 Connect to contact A of
X1 in series Example Ladder diagram:
X0 X1
Y1
OUT Y1 Drive Y1 coil
Chapter 16 PLC Function |CT2000 Series
16-38
Mnemonic Function AND Series connection- A contact
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399
Operand
9 9 9 9 9 －
The AND command is used in the series connection of A contact. The function of the command is to readout the status of present specific series connection contacts first, and then to perform the “AND” calculation with the logic calculation result before the contacts, thereafter, saving the result into the accumulative register.
Command code: Operation:
LDI X1 Load contact B of X1
AND X0 Connect to contact A of X0 in series Example
Ladder diagram:
X1 X0
Y1
OUT Y1 Drive Y1 coil
Mnemonic Function ANI Series connection- B contact
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
9 9 9 9 9 －
The ANI command is used in the series connection of B contact. The function of the command is to readout the status of present specific series connection contacts first, and then to perform the “AND” calculation with the logic calculation result before the contacts, thereafter, saving the result into the accumulative register.
Command code: Operation:
LD X1 Load contact A of X1
ANI X0 Connect to contact B of X0 in series Example
Ladder diagram:
X1 X0
Y1
OUT Y1 Drive Y1 coil
Mnemonic Function OR Parallel connection- A contact
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399
Operand
9 9 9 9 9 －
The OR command is used in the parallel connection of A contact. The function of the command is to readout the status of present specific series connection contacts, and then to perform the “OR” calculations with the logic calculation result before the contacts, thereafter, saving the result into the accumulative register.
Chapter 16 PLC Function |CT2000 Series
16-39
Command code: Operation:
LD X0 Load contact A of X0
OR X1 Connect to contact A of X1 in parallel OUT Y1 Drive Y1 coil Example
Ladder diagram:
X0 X1
Y1
Mnemonic Function ORI Parallel connection- B contact
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
9 9 9 9 9 －
The ORI command is used in the parallel connection of B contact. The function of the command is to readout the status of present specific series connection contacts, and then to perform the “OR” calculations with the logic calculation result before the contacts, thereafter, saving the result into the accumulative register.
Command code: Operation:
LD X0 Load contact A of X0 ORI X1 Connect to contact B of
X1 in parallel OUT Y1 Drive Y1 coil Example Ladder diagram:
X0 X1
Y1
Mnemonic Function ANB Series connection (Multiple Circuits)
Operand None
To perform the “ANB” calculation between the previous reserved logic results and contents of the accumulative register.
Command code: Operation:
LD X0 Load contact A of X0 ORI X2 Connect to contact B of
X2 in parallel
LDI X1 Load contact B of X1 OR X3 Connect to contact A of
X3 in parallel
ANB Connect circuit block in series
Example Ladder diagram:
X1 X3
Y1 X0
X2
ANB
Block A Block B
OUT Y1 Drive Y1 coil
Mnemonic Function ORB Parallel connection (Multiple circuits)
Operand None
ORB is to perform the “OR” calculation between the previous reserved logic results and contents of the accumulative register.
Chapter 16 PLC Function |CT2000 Series
16-40
Command code: Operation:
LD X0 Load contact A of X0 ANI X1 Connect to contact B of
X1 in series
LDI X2 Load contact B of X2 AND X3 Connect to contact A of
X3 in series
ORB Connect circuit block in parallel
Example Ladder diagram:
X1 X3
Y1 X0
X2
ORB Block A
Block B
OUT Y1 Drive Y1 coil Mnemonic Function
MPS Store the current result of the internal PLC operations
Operand None
To save contents of the accumulative register into the operation result. (the result operation pointer pluses 1)
Mnemonic Function MRD Reads the current result of the internal PLC operations
Operand None
Reading content of the operation result to the accumulative register. (the pointer of operation result doesn’t move)
Mnemonic Function MPP Reads the current result of the internal PLC operations
Operand None
Reading content of the operation result to the accumulative register. (the stack pointer will decrease 1)
Command code: Operation:
LD X0 Load contact A of X0 MPS Save in stack
AND X1 Connect to contact A of X1 in series
OUT Y1 Drive Y1 coil MRD
Read from the stack (without moving pointer)
AND X2 Connect to contact A of X2 in series
OUT M0 Drive M0 coil
MPP Read from the stack OUT Y2 Drive Y2 coil
Example Ladder diagram:
X0
Y1 X1
M0 X2
Y2 END
MPP MRD
MPS
END End program
Chapter 16 PLC Function |CT2000 Series
16-41
Mnemonic Function OUT Output coil
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
－ 9 9 － － －
Output the logic calculation result before the OUT command to specific device.
Motion of coil contact:
OUT command Contact Operation
result Coil A contact (normally open)
B contact (normally closed) FALSE Off Non-continuity Continuity
TRUE On Continuity Non-continuity
Command code: Operation:
LD X0 Load contact B of X0 AND X1 Connect to contact A of
X1 in series Example Ladder diagram:
X0 X1
Y1
OUT Y1 Drive Y1 coil
Mnemonic Function SET Latch (ON)
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
－ 9 9 － － －
When the SET command is driven, its specific device is set to be “ON,” which will keep “ON” whether the SET command is still driven. You can use the RST command to set the device to “OFF”.
Command code: Operation:
LD X0 Load contact A of X0 AN Y0 Connect to contact B of
Y0 in series Example
Ladder diagram:
Y0 X0
Y1 SET
SET Y1 Y1 latch (ON)
Mnemonic Function RST Clear the contacts or the registers
X0~X17 Y0~Y17 M0~M799 T0~159 C0~C79 D0~D399 Operand
－ 9 9 9 9 9
When the RST command is driven, motion of its specific device is as follows:
Device Status
Y, M Coil and contact will be set to “OFF”.
T, C Present values of the timer or counter will be set to 0, and the coil and contact will be set to “OFF.”
D The content value will be set to 0.
When the RST command is not driven, motion of its specific device is unchanged.
Chapter 16 PLC Function |CT2000 Series
16-42
Command code: Operation:
LD X0 Load contact A of X0 Example Ladder diagram
X0
RST Y5 RST Y5 Clear contact Y5
Mnemonic Function TMR 16-bit timer
T-K T0~T159, K0~K32,767 Operand
T-D T0~T159, D0~D399