Omron NX-SID800 User Manual

7 Programming
7 - 8
NX-series Safety Control Unit User’s Manual (Z930)
The specifications for variables in function blocks are given below.
Refer to 7-2-4 Attributes of Variables on page 7-14 for details on the variable attributes that can be set
for each type of variable.
Variable Designations for Function Blocks
Variables
Number
*1
*1. The individual restrictions are listed in the above table. The actual upper limits depend on the overall program capacity
and internal memory capacity.
Specification
Input variables
1 to 64 Input variables are used as input arguments within the function block. They
cannot be changed inside the function block.
• When the function block is executed, the input variables are set to the
values of the input parameters.
• You can specify either constants or variables for input parameters.
• Omitting Input Parameters:
Refer to Operation When Parameters Are Omitted in 7-5-3 Common
Operations for Functions (FUNs) and Function Blocks (FBs) in the
NX-series Safety Control Unit Instructions Reference Manual (Cat. No.
Z931).
Output variables
1 to 64 Output variables are used as output arguments from the function block.
• The output parameters are set to the values of the output variables at the
end of execution.
• You cannot specify a constant for an output parameter. Only variables
may be specified.
• You can omit output parameter connections. If you omit an output param-
eter, the value of the output variable is not assigned to any parameter.
• Omitting Output Parameters:
Refer to Operation When Parameters Are Omitted in 7-5-3 Common
Operations for Functions (FUNs) and Function Blocks (FBs) in the
NX-series Safety Control Unit Instructions Reference Manual (Cat. No.
Z931).
• You can access the value from outside of the function block. Access
these values with the following format: InstanceName.OutputVariable-
Name. However, you cannot write values directly to an output variable.
Internal variables
No limit Internal variables are used for temporary storage within a function block.
• The values of internal variables are retained regardless of whether the
function block is executed.
• The values cannot be referenced from outside of the function block.
Input parameter
Output parameter
Value is assigned.
Value is assigned.
Input variables Internal variables Output variables
Function block definition name
or instruction name
Instance name

Omron NX-SID800 Specifications

General

Brand	Omron
Model	NX-SID800
Category	Controller
Language	English