Ny-Series Instructions Reference Manual (W560 - Omron NY532-5400 Reference Manual

2 Instruction Descriptions
Maximum Read/Write Data Size
The maximum size of the data that you can read depends on whether the connection was opened with
the CIPOpen instruction or the CIPOpenWithDataSize instruction as shown in the following table.
Instruction that opened the
connection
CIPOpen
CIPOpenWithDataSize
* The maximum size is 1,990 for NX1P2 and NJ-series CPU Units.
The maximum size of the data that you can write depends on whether there is a request path attribute
and the instruction that established the connection, as given below.
Maximum write data size [bytes] = Base size − Attribute usage
Item in above formula
Base size
*1
Attribute usage
*1 With a CPU Unit with unit version 1.10 or earlier or Sysmac Studio version 1.14 or lower, the values are as fol-
lows:
Attribute ID used: 12 bytes
Attribute ID not used: 8 bytes
Related System-defined Variables
Name
*1
_EIP_EtnOnlineSta
*2
_EIP1_EtnOnlineSta
*3
_EIP2_EtnOnlineSta
*4
_EIPIn1_EtnOnlineSta
*1 Use this variable name for an NJ-series CPU Unit.
*2 Use this variable name for port 1 on an NX-series CPU Unit, or for an NY-series Controller.
*3 Use this variable name for port 2 on an NX-series CPU Unit.
*4 Use this variable name for the internal communication port on an NY-series Controller.
Additional Information
Refer to the following manuals for details on CIP communications.
• NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (Cat. No. W506)
• NY-series Industrial Panel PC / Industrial Box PC Built-in EtherNet/IP Port User's Manual (Cat. No.
W563)
• CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (Cat. No. W495)
2-1018
1,990 bytes
With 8,188* as the upper limit, responses returned by the server can be read.
• Connection established with the CIPOpen instruction: 1,992 bytes
• Connection established with the CIPOpenWithDataSize instruction: Data-
Size in CIPOpenWithDataSize instruction − 2
Attribute ID used: 14 bytes
Attribute ID not used: 10 bytes
Data
Meaning
type
Online BOOL
Maximum size of data that you can read
Meaning
Description
This variable indicates when built-in EtherNet/IP
port communications can be used.
TRUE: Communications are possible.
FALSE: Communications are not possible.

NY-series Instructions Reference Manual (W560)