3-5 Monitoring I/O Status
3-5-1 Monitoring I/O Status
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3-5 Monitoring I/O Status
The ON/OFF status of input bits (i.e., the execution conditions) and the present values of
operands in special instructions in a ladder program can be monitored. Start the Ladder
Monitor in the I/O status monitoring state.
3-5-1 Monitoring I/O Status
•
ON/OFF Displays of Input Bits and Lines
The symbol for the input bit will change color according to the ON/OFF status of the bit. In
addition, the lines connected to the input bits will also change color.
OFF ON ON OFF
OFF
OFF
Status of contacts
ON
OFF
OFF ON
Note: The execution conditions on connecting lines passing through the following symbols will not
be displayed.
• Condition flags (=, ER, CY, >=, >, <=, <, <>, AER, N, OF, UF), and input conditions with
IR or DR as operands
• Comparison instructions using DM/EM indirect addressing
• Time comparison instructions (such as =DT)
•
Present Values of Special Instruction Operands (Words)
For special instructions, word present values are displayed above the operand as shown
below. Present values can be displayed as hexadecimal, decimal (&), or signed decimal
(+-), in a maximum of 11 digits. Any portion beyond 11 digits will be shown as an
underline.
ON
3225 0000
[MOV D32767 D32760]
The present value of a special instruction will be displayed in floating-point decimal
numbers as shown below.
+ 0.123e + 456
Sign Mantissa Sign Exponent
Example: -0.102e-001, +0.123e+456 etc…
3-5-2 Stopping I/O Status Monitoring
Use the following procedures to stop and restart I/O status monitoring.
1. To stop I/O status monitoring, press the Menu Button and select Ladder Monitor
Stop from the menu.
2. To restart I/O status monitoring, press the Menu Button and select Ladder Monitor
Start from the menu.
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