Omron NX-SL series User Manual

4 Safety Function Blocks
4 - 50
NX-series Safety Control Unit Instructions Reference Manual (Z931)
• This FB controls a guard lock. It monitors the guard and lock position. You can use this FB with a
mechanical lock switch.
• The operator requests access to a hazardous area. The guard can be unlocked only when the haz-
ardous area is in a safe state. If the guard is closed, it can be locked. If the guard is closed and
locked, the mechanical device can be started. An open guard or an unlocked guard is detected as a
situation that has a serious impact on safety.
• Activate the S_StartReset and S_AutoReset inputs only when you can ensure that no hazardous
state will occur as the result of starting the Safety CPU Unit.
 Operating Sequence
Output Variables
Variable Data type Valid range Default Description
Ready BOOL TRUE or FALSE FALSE Refer to Safety FB Common Output Variables on page
4-4.
S_GuardLocked SAFEBOOL TRUE or FALSE FALSE Connect this output to actuator that is the hazard source
inside the guard. The safety output changes to FALSE
when there is a request to unlock the guard.
FALSE: A non-safe state exists.
TRUE: A safe state exists.
S_UnlockGuard SAFEBOOL TRUE or FALSE FALSE The guard unlock signal.
FALSE: Closes the guard.
TRUE: Releases the guard.
Error BOOL TRUE or FALSE FALSE Refer to Safety FB Common Output Variables on page
4-4.
DiagCode WORD Depends on state
code.
16#0000 Refer to Safety FB Common Output Variables on page
4-4.
Function
1 External A request is made to place the hazardous area in the safe state. (This is not included in
this FB.)
2 Input Feedback is given from the relevant hazardous area that it is in the safe state. (Use
S_SafetyActive.)
3 Input Operator requests unlocking the guard. (Use UnlockRequest.)
4 Output Opening the guard is enabled. (Use S_UnlockGuard.)
5 Input The guard is unlocked. (Use S_GuardLock.)
Opening the guard is enabled (S_GuardLocked = FALSE). The operator opens the guard.
6 Input Monitoring the status of the guard through S_GuardMonitoring (signal for closing the guard
again) starts.
7 Input The operator provides feedback (Reset) to start the hazardous area again.
8 Output The guard is locked (S_UnlockGuard).
9 Input The locking of the guard is confirmed (S_GuardLock).
10 Output The hazardous area is made operational again (S_GuardLocked = TRUE).
11 External Operation in the hazardous area is restarted.

Omron NX-SL series Specifications

General

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

Summary

Introduction to Instructions for Safety Control Units and Interpreting Instruction Descriptions

Types of Instructions

Describes the three types of instructions used with Safety Control Units.

Interpreting Instruction Descriptions

Explains the notation used to describe instructions.

Standard Functions

Execution Control Instructions

Details instructions for controlling program execution flow.

Data Type Conversion Instructions

Explains instructions for converting data types between different formats.

Boolean Operation Instructions

Describes instructions for performing logical Boolean operations.

Math Instructions

Details instructions for arithmetic operations on integers and durations.

Comparison Instructions

Instructions for comparing values of variables.

Selection Instructions

Instructions for selecting values based on conditions.

Safety Standard Function Blocks

Safety Standard Function Block Instructions

Lists and describes safety standard function block instructions.

SF_CTD

Decrements the counter value when the counter input signal is received.

SF_CTU

Increments the counter value when the counter input signal is received.

SF_CTUD

Creates an up-down counter operating on up and down counter inputs.

SF_F_TRIG

Outputs TRUE for one task period when the input signal changes to FALSE.

SF_R_TRIG

Outputs TRUE for one task period when the input signal changes to TRUE.

SF_RS

Retains the value of a SAFEBOOL variable, giving priority to Reset.

SF_SR

Retains the value of a SAFEBOOL variable, giving priority to Set.

SF_TOF

Outputs FALSE when the set time elapses after the timer starts.

SF_TON

Outputs TRUE when the set time elapses after the timer starts.

SF_TP

Outputs TRUE during the set time after the timer starts.

Safety Function Blocks

General Rules for Safety Function Blocks

Provides general rules for safety function blocks, including rules specific to FBs.

Safety Function Block Instructions

Lists and describes various safety function blocks.

SF_Antivalent

Monitors discrepancy time for two antivalent SAFEBOOL inputs.

SF_EDM

Controls a safety output and monitors actuator control.

SF_EmergencyStop

Monitors the input from an emergency stop button.

SF_EnableSwitch

Supports stopping a safety function using an enable switch.

SF_Equivalent

Monitors discrepancy time for two equivalent SAFEBOOL inputs.

SF_ESPE

Monitors electro-sensitive protective equipment (ESPE).

SF_GuardLocking

Controls entry to hazardous areas with a four-state interlock guard.

SF_GuardMonitoring

Monitors safety guards and opens/closes them.

SF_ModeSelector

Selects system operation mode (automatic, manual, etc.).

SF_MutingPar

Performs parallel muting with four muting sensors.

SF_MutingPar_2Sensor

Performs parallel muting with two muting sensors.

SF_MutingSeq

Performs sequential muting with four muting sensors.

SF_OutControl

Controls a safety output with control and safety signals.

SF_SafetyRequest

Makes requests for safe state and monitors actuator safety state.

SF_TestableSafetySensor

Tests functionality with external test function of ESPE sensors.

SF_TwoHandControlTypeII

Provides type II, two-hand control function per ISO 13851.

SF_TwoHandControlTypeIII

Provides type III, two-hand control function per ISO 13851.

Index