The safety sequencer conforms to "EN ISO 13849-1 Category 4 PL e" and "IEC 61508 SIL 3". Can be used for medium and large scale safety control. Achieve flexible programming with safety FB ^{* 1} with ladder & safety certification .

* 1. Safety applications up to EN ISO 13849-1 Category 4 / PL e and IEC 61508 SIL 3 can be built.

Solves the problem of conventional safety circuit construction

MELSEC-QS series will solve the problems and problems of conventional safety circuit construction, such as complicated wiring and time-consuming troubleshooting.

Programming with ladder and safety FB is possible

GX Developer

With "GX Developer", you can start up (program, monitor, diagnose, and debug) the safety sequencer of the MELSEC-QS series. You can also set parameters for CC-Link Safety, CC-Link IE Field Network, and safety remote stations. ^{* 1}

* 1. GX Works2 is required for CC-Link IE Field Network settings of general programmable controllers.

Safety FB (function block) ^{* 2}

The functions frequently used when creating safety programs are provided as safety FBs. Safety FB has obtained safety certification.

Safety FB list

FB name	Function Name	Functional overview
F + 2HAND2	Two-hand switch type	Control of type II two-hand control switch
F + 2HAND3	Two-hand switch type	Control of type II two-hand operation switch (duplex mismatch time is fixed at 500ms)
F + EDM	External device monitor	Monitoring of safety shut-off devices such as actuators and contactors and control of safety outputs
F + ENBLSW	Enable switch	Evaluation of input signal of 3-position enable switch
F + ESPE	Light curtain (ESPE)	Emergency stop of stop category 0 by light curtain etc.
F + ESTOP	emergency stop	Emergency stop of stop category 0 by emergency stop switch
F + GLOCK	Guard interlock	Security guard (4-state interlock) with guard lock function controls intrusion into hazardous areas
F + GMON	Guard monitoring	Monitoring of safety guard by two safety switches, monitoring of mismatch time (MonitoringTime) of redundant switch when guard is closed
F + MODSEL	Mode selection	Selection of operation mode such as manual or semi-automatic
F + MUTE2	Parallel muting with two sensors	Disable the light curtain safety function using two sensors (muting)
F + MUTEP	Parallel muting	Muting the light curtain safety function with four parallel sensors
F + MUTES	Series muting	Muting of the light curtain safety function by four sensors arranged in series
F + OUTC	Output control	Setting of safety output control and start prohibition by application and general control device
F + TSSEN	Safety sensor test	Test function of external sensors that can be tested (such as light curtains) (eg, loss of detection function of sensor unit, excessive response time, ON sticking of single channel sensor)
F + EQUI	Redundant input (NC + NC or NO + NO)	Monitors the status of 2 safety input signals (2 NO contacts or 2 NC contacts) and outputs the results
F + ANTI	Redundant input (NO + NC)	Monitors the status of two safety input signals (NC contact and NO contact) and outputs the result

* 2. Safety FB is installed in GX Developer version 8.82L or later. (The QS001CPU supports serial numbers with the first five digits 11042 or later.)

Easy maintenance when an error or failure occurs

PC diagnosis

You can check the operating status of the safety CPU, current errors, and operation / error histories (including error histories of the CC-Link Safety system). Up to 3000 operation / error histories can be recorded and saved to a CSV file.

Error details

In the case of a safety remote I / O station, the error name, date and time of occurrence, details of error and action are displayed.

Use of debug function

By adopting the safe CPU operation mode, the conventional convenient debugging functions (device test, writing during RUN, etc.) can be used only in the test mode.