Omron NX-SL series User Manual

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1 Introduction to Instructions for Safety Control Units and Interpreting Instruction Descriptions
NX-series Safety Control Unit Instructions Reference Manual (Z931)
1-2 Interpreting Instruction
Descriptions
1
1-2-4 Timer Set Values
Time set values, such as those for DiscrepancyTime or the OFF-Delay Timer instruction, operate in
increments of the safety task period.
The timer error is +1 safety task period. Every safety task period, a timer value is checked to see if it
has reached the set time. If the timer value reaches the set time immediately after this check, the time
is delayed by one safety task period.
Examples are provided below.
 When the OFF-Delay Timer Instruction Is Set to 500 ms and the Safety Task
Period Is Set to 16 ms
The timer will time out 512 ms (16 ms × 32) after the safety task is started.
 When the OFF-Delay Timer Instruction Is Set to 500 ms and the Safety Task
Period Is Set to 20 ms
The timer will time out 520 ms (20 ms × 26) after the safety task is started. Care is required because
the timer will not operate at 500 ms.
Refer to the NX-series Safety Control Unit User’s Manual (Cat. No. Z930) for details on the safety task
period.
Precautions for Correct Use
The time when an OFF-Delay Timer instruction times out can affect the safety reaction times.
1-2-4 Timer Set Values

Omron NX-SL series Specifications

General

Brand	Omron
Model	NX-SL series
Category	Control Unit
Language	English