I/O Response Times For Communications Between Nx Units On Ethernet/Ip Slave Terminals - Omron NX-SL3300 User Manual

Appendices
A-12 I/O Response Times for Communica-
tions between NX Units on
EtherNet/IP Slave Terminals
This section describes the input response times and output response times for communications be-
tween NX Units on EtherNet/IP Slave Terminals.
Input Response Times
The input response time gives the time required from when an external signal is input to the NX Unit
until it is processed by the Safety CPU Unit.
The maximum input response time is calculated as follows:
Formula: Maximum input response time = Safety task period + Tnx-Indelay + 4.5 ms
The elements in the formulas are as follows:
• Safety task period: Setting of the safety task period in the Safety CPU Unit
• Tnx-Indelay: Input delay time of the NX Unit
Output Response Times
The output response time is the time from data processing on the Safety CPU Unit until the results are
externally output from an NX Unit.
The maximum output response time is calculated as follows:
Formula: Maximum output response time = Safety task period + Tnx-OutProc + Tnx-Outdelay + 4.5 ms
The elements in the formulas are as follows:
• Safety task period: Setting of the safety task period in the Safety CPU Unit
• Tnx-OutProc: Output data processing time of the NX Unit
• Tnx-Outdelay: Output delay time of the NX Unit
Definition of Formula Elements and Calculation Methods
This section defines the elements and describes the calculation methods.
l Tnx-Indelay
This is the input delay time of the NX Unit. It is the time required to read the status of the input
terminals into NX Unit memory. There is a unique value for each type of NX Unit.
The NX Unit input delay time is different for each type of NX Unit. The following table gives the defi-
nition of the input delay time for each type of NX Unit.
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NX-series Safety Control Unit User's Manual (Z930)