Monitoring I/O Status; Stopping I/O Status Monitoring - Omron ns series Operation Manual

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.
Status of contacts
Note:
• 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.
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.
OFF O FF OFF
ON OFF ON
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)
ON
3225
[MOV D32767
3-5
3-5-1
ON ON OFF
OFF
0000
D32760]
Monitoring I/O Status
Monitoring I/O Status
67