5 I/O Memory
5-22
CP2E CPU Unit Software User’s Manual(W614)
z
Range of Values
The contents of Data Registers are treated as signed binary data and thus have a range of –
3
2,76
8
to
3
2,767.
The content of Data Registers cannot be accessed (read or written) from the CX-Programmer.
z
Data Register Initialization
The Data Registers will be cleared in the following cases:
•
The operating mode is changed from PROGRAM mode to RUN/MONITOR mode or vice-versa
and the IOM Hold Bit is OFF.
•
The PLC
’
s power supply is cycled and the IOM Hold Bit is OFF or not set to be held in the PLC
Setup.
•
A fatal error occurs (except for one created with FALS).
Note
If the IOM Hold Bit (A500.12) is ON, the Data Registers will not be cleared when a FALS error
occurs or the operating mode is changed from PROGRAM mode to RUN/MONITOR mode or
vice-versa.
Precautions for Correct Use
Precautions for Correct Use
•
Do not use Data Registers until a value has been set in the register. The register's operation
will be unreliable if they are used without setting their values.
•
The values in Data Registers are unpredictable at the start of an interrupt task. When a Data
Register will be used in an interrupt task, always set a value in the Data Register before using
the register in that task.
Hexadecimal content
Decimal equivalent
8
000 to FFFF
–
3
2,76
8
to –1
0000 to 7FFF
0 to
3
2,767
Summary of Contents for SYSMAC CP Series
Page 3: ......
Page 32: ...1 Overview 1 4 CP2E CPU Unit Software User s Manual W614 ...
Page 44: ...3 CPU Unit Operation 3 8 CP2E CPU Unit Software User s Manual W614 ...
Page 116: ...6 I O Allocation 6 8 CP2E CPU Unit Software User s Manual W614 ...
Page 144: ...7 PLC Setup 7 28 CP2E CPU Unit Software User s Manual W614 ...
Page 170: ...10 Interrupts 10 14 CP2E CPU Unit Software User s Manual W614 ...
Page 200: ...11 High speed Counters 11 30 CP2E CPU Unit Software User s Manual W614 ...
Page 272: ...12 Pulse Outputs 12 72 CP2E CPU Unit Software User s Manual W614 ...
Page 278: ...13 PWM Outputs 13 6 CP2E CPU Unit Software User s Manual W614 ...
Page 460: ...18 Programming Device Operations 18 28 CP2E CPU Unit Software User s Manual W614 ...
Page 576: ...Revision 2 CP2E CPU Unit Software User s Manual W614 ...
Page 577: ......