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SF_GuardLockingSerial

This is the web edition of the original ‎⮫ AC500-S safety user manual, version 1.3.2. This web edition is provided for quick reference only. The original safety user manual must be used to meet functional safety application requirements.

Standards

Requirements

ISO 14120:2015

3.5 Interlocking guard

  • the hazardous machine functions "covered" by the guard cannot operate until the guard is closed and locked;

  • if the guard is opened while hazardous machine functions are operating, a stop command is given;

  • when the guard is closed, the hazardous machine functions "covered" by the guard can operate (the closure of the guard does not, by itself, start the hazardous machine functions)

3.5.1 Interlocking guard with a start function

control guard

special form of interlocking guard which, once it has reached its closed position, gives a command to initiate the hazardous machine function(s) without the use of a separate start control

3.5.2 Interlocking guard with guard locking

guard associated with an interlocking device and a guard locking device so that, together with the control system of the machine, the following functions are performed:

… - the guard remains closed and locked until the risk due to the hazardous machine functions “covered” by the guard has disappeared;

ISO 14119:2013

Interlocking devices associated with guards – principles for design and selection

ISO 13849-1:2015

5.2.2 Manual reset function

Note: A positive edge evaluation has the same quality as a negative edge evaluation.

ISO 12100:2010

6.2.11.4

Restart after power interruption

If a hazard could be generated, the spontaneous restart of a machine when it is re-energized after power interruption shall be prevented (e.g., by use of a self-maintained relay, contactor or valve).
SF_GuardLockingSerial

This FB controls an entrance to a hazardous area via an interlocking guard with guard locking ("four state interlocking"). The used switch does not distinguish between if the safety door is unlocked but closed or unlocked and opened. Therefore, we only have the S_Guard input compared to FB SF_GuardLocking_2.

This function controls the guard lock and monitors the position of the combination of guard and lock. This function block can be used with a mechanical locked switch.

The operator requests to get access to the hazardous area. The guard can only be unlocked when the hazardous area is in a safe state. The guard can be locked if the guard is closed. The machine can be started when the guard is closed and the guard is locked. An unlocked guard will be detected to initiate a safety reaction.

The S_StartReset and S_AutoReset inputs shall only be activated if it is ensured that no hazardous situation can occur when the PES is started.

Table 1051: FB name: SF_GuardLockingSerial

Name

Data type

Initial value

Description, parameter values

VAR_INPUT

Activate

BOOL

FALSE

⮫ Table 995 “General input parameters”

S_Guard

BOOL

FALSE

Variable.

Monitors the guard interlocking. Can be connected to the S_GuardOut of the SF_Guard FB.

FALSE: Guard open.

TRUE: Guard closed and guarded area safe.

S_SafetyActive

BOOL

FALSE

Variable.

Status of the hazardous area (EDM), e.g., based on speed monitoring or safe time off delay.

FALSE: Machine in non-safe state.

TRUE: Machine in safe state.

UnlockRequest

BOOL

FALSE

Variable.

Operator intervention – request to unlock the guard.

FALSE: No request.

TRUE: Request made.

S_StartReset

BOOL

FALSE

⮫ Table 995 “General input parameters”

S_AutoReset

BOOL

FALSE

⮫ Table 995 “General input parameters”

Reset

BOOL

FALSE

⮫ Table 995 “General input parameters”

Also used to request the guard to be locked again. The quality of the signal must conform to a manual reset device.

VAR_OUTPUT

Ready

BOOL

FALSE

⮫ Table 996 “General output parameters”

S_GuardLocked

BOOL

FALSE

Interface to hazardous area which must be stopped.

FALSE: No safe state.

TRUE: Safe state.

S_UnlockGuard

BOOL

FALSE

Signal to unlock the guard.

FALSE: Close guard.

TRUE: Unlock guard.

SafetyDemand

BOOL

FALSE

Optional.

⮫ Table 996 “General output parameters”

ResetRequest

BOOL

FALSE

Optional.

⮫ Table 996 “General output parameters”

Error

BOOL

FALSE

⮫ Table 996 “General output parameters”

DiagCode

WORD

16#0000

⮫ Table 996 “General output parameters”

Typical timing diagram

Fig. 519: Typical timing diagram for SF_GuardLockingSerial
SF_GuardLockingSerial_TimingDiagram

Error detection

Static signals are detected at Reset. Errors are detected at the Guard switches.

Error behavior

In the event of an error the S_GuardLocked and S_UnlockGuard outputs are set to FALSE, the DiagCode output indicates the relevant error code, and the Error output is set to TRUE. An error must be acknowledged by a rising trigger at the Reset input.

Function block-specific error and status codes

Table 1052: FB-specific error codes

DiagCode

State name

State description and output setting

C001

Reset Error 0

Static Reset detected in state 8x01.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

C010

Guard Error

S_Guard is not TRUE although the door was not requested to be opened.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

C011

Reset Error 1

Static Reset detected in state C410.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

C410

Guard Return

S_Guard becomes TRUE again after being lost (C010).

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = TRUE

Cx50

Safety Lost

Lost safety acknowledge signal.

IF S_Guard = TRUE THEN x = 4 ELSE x = 0

Output signals for x = 4 (C450):

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = TRUE

Output signals for x = 0 (C050):

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

C021

Reset Error 2

Static Reset detected in state C420.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

C420

Safety Return

Safety acknowledge signal becomes TRUE again after being lost (Cx50).

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = TRUE

C031

Reset Error 3

Static Reset detected in state 8430.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

Cx40

Unlock Request Error

Waiting time to Unlock exceeded.

IF S_Guard = TRUE THEN x = 4 ELSE x = 0

Output signals for x = 4 (C440):

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = TRUE

Output signals for x = 0 (C040):

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE

C041

Reset Error 4

Static Reset detected in state Cx40.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = TRUE
Table 1053: FB-specific status codes (no error):

DiagCode

State name

State description and output setting

0000

Idle

The function block is not active (initial state).

Ready = FALSE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = FALSE

8000

Guard Closed and Locked

Guard is closed and locked.

Ready = TRUE

S_GuardLocked = TRUE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = FALSE

Error = FALSE

8x01

Init

Function block was activated and initiated.

IF S_Guard = TRUE THEN x = 4 ELSE x = 8

Output signals for x = 4 (8401):

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = FALSE

Output signals for x = 8 (8801):

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = TRUE

ResetRequest = FALSE

Error = FALSE

8430

Wait for Reset

Door is closed and locked, now waiting for operator reset.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = FALSE

8812

Wait for Operator

Waiting for operator to request to open the door (unlock request).

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = FALSE

SafetyDemand = TRUE

ResetRequest = FALSE

Error = FALSE

8822

Guard Open and/or Unlocked

Guard is unlocked. Door can be closed or open.

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = TRUE

ResetRequest = FALSE

Error = FALSE

8410

Wait for Unlocked

S_UnlockGuard is TRUE, however the acknowledge signal S_GuardLocked is still TRUE (waiting for acknowledge FALSE).

Ready = TRUE

S_GuardLocked = FALSE

S_UnlockGuard = TRUE

SafetyDemand = FALSE

ResetRequest = TRUE

Error = FALSE