Omron NJ Series User Manual

A-111
Appendices
NJ-series CPU Unit Software User’s Manual (W501)
A-10 Size Restrictions for the User Program
App
A-10-1 User Program Object Restrictions
A-10 Size Restrictions for the User
Program
There are size restrictions for the user program due to the limitations of the memory capacity in the
CPU Unit and other factors. If you exceed these restrictions, errors will occur during operation. This
section describes each of the size restrictions of a user program that is created in a CPU Unit.
You can check the approximate sizes of the user program and variables with the memory display func-
tions of the Sysmac Studio.
Be careful not to exceed these restrictions when you create the user program. The restrictions that are
given in this section, however, are only reference values for use as guidelines. We recommend that you
ensure ample leeway for the restrictions to allow for the possibility of future user program expansion as
well as for other reasons.
Precautions for Correct UsePrecautions for Correct Use
Errors can occur during online editing even if the user program size restrictions are not
exceeded. This is because even if you change the user program with online editing, other data
that is allocated in the memory of the CPU Unit may remain. If errors occur, change the Control-
ler to PROGRAM mode and transfer the user program to the Controller again to reset the errors.
This section describes the restrictions to user program objects. There are restrictions for the following
objects.
• POU
• Variables
• Data type definitions
• Constants (literals)
There are restrictions both on POU definitions and POU instances.
 POU Definition Restrictions
POU definitions are subject to the following restrictions.
A-10-1 User Program Object Restrictions
POU Restrictions
Restriction
CPU Unit model
NJ501- NJ301-
Maximum number of programs 500 500
Maximum value of the following: Number of function block
definitions + Number of function definitions + Number of lad-
der diagram sections
3,000 750
Maximum total number of input, output, and in-out variables
in function block and function definitions
64 64

Omron NJ Series Specifications

General

Program Capacity	Up to 128 MB
SD Card Slot	Yes
Power Supply Voltage	24 VDC
Motion Control	Yes
USB Ports	1
Operating Temperature	0°C to 55°C
Communication Interfaces	Ethernet/IP, EtherCAT, USB
Safety Function	Optional
Storage Temperature	-20°C to 75°C
Communication Ports	USB
Dimensions	Varies by model
Weight	Varies by model