POC Type 2 GuardShield Type 2
OverviewThe Allen-Bradley Guardmaster GuardShield Type 2 safety light curtain is a new addition to the ABGM portfolio of Opto-Electronic safety devices. The “Type 2” designation means that this particular safety light curtain meets a lesser requirement for performance under fault conditions than the GuardShield Type 4. As a result, the GuardShield Type 2 safety light curtain can only be applied in applications where a formal risk assessment has determined that a Type 2 device is sufficient to meet the level of risk posed by the hazard.
There are a number of regulations that discuss risk assessment. The US based methods of conducting risk assessments which provide guidance for the determination of the level of risk to personnel can be found as follows:
- ANSI TR3—for machinery
- ANSI/RIA 15.05—for the Robotics industry
- ANSI/ISO 12100-1 Safety of Machinery
Typically in North America the use of Type 2 light curtains is not allowed for machinery or equipment covered by ANSI/OSHA regulations and standards whose requirement for performance under fault conditions is "control reliability." Type 2 light curtains do not meet the requirements of "control reliability."
The European Union requires the Risk Assessment be performed per EN ISO 14121 "Principles for Risk Assessment."
Safeguarding of the machine must be appropriate to the foreseeable risks and identified hazards. The level(s) of risk determined from the completion of a formal risk assessment indicate the level of the safety device required. In many instances it is necessary to use a combination of safety devices for adequate protection of personnel from hazards based on the risk assessment.
What Is "Type 2" and "Type 4"
Three types of safety ESPEs (Electro-Sensitive Protective Equipment) are defined within International and European standard IEC/EN 61496 Parts 1 and 2. This standard specifies the requirements for the design, construction, testing and performance of ESPEs—designed specifically to detect persons as part of a safety related system. The three types differ in their performance in the presence of faults and under influences from environmental conditions.
A Type 2 safety light curtain requires:
- A single fault resulting in the loss of detection capability,
- Failure of the OSSDs to go to the OFF state,
- Shall cause the light curtain to lock out as a result of the cycling of power, the next periodic test, or the interruption of the sensing function.
A Type 2 device requires the need for a periodic test of the system prior to a demand on the system, i.e., interruption of the light curtain's sensing field. This periodic test may be initiated by a simple manually operated switch (e.g., pushbutton) or by a more complex automatically controlled PLC.
Ideally the periodic test will be twice the operator interface frequency of exposure to the hazard.
The Type 4 device is required to detect a fault in its safety circuitry and immediately switch to a lock-out condition when the fault occurs. The fault detection is assured through diverse redundancy and cross monitoring of the internal circuit. A Type 4 device will fail to a safe state in the presence of an accumulation of undetected faults.
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Type 2 safety light curtains do not meet OSHA regulations nor ANSI published standards, which define the requirements of “Control Reliability,” therefore it is not allowable to use a Type 2 safety light curtain device on equipment or machinery that requires “Control Reliability.” |
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Description
The Allen-Bradley Guardmaster GuardShield Type 2 safety light curtain is a self contained “two box,” Type 2 safety light curtain. Designed for use on or around machinery in which a formal risk assessment has determined that a Type 2 safety device is of a sufficient level of safety to meet the guarding application, the GuardShield Type 2 is the ideal solution. GuardShield Type 2 is offered in either a “Guard Only” operating mode or in a factory configured operating mode of restart interlock with external device monitoring. In either operating mode, the GuardShield Type 2 safety light curtain will provide the appropriate level of protection to personnel.
The GuardShield Type 2 is designed to protect personnel from equipment or machinery hazards where the risk of injury are low. A formal risk assessment should be performed prior to selecting the proper safeguarding device. In many instances it is necessary to use a combination of safety devices to assure complete protection of personnel from hazards.
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Safety light curtains of a Type 2 level of safety typically do not meet OSHA or ANSI requirements of “Control Reliability,” therefore it is not allowable to use a safety device of a Type 2 level on or around equipment or machinery that requires “Control Reliability.” |
Applications
- Conveyors
- Packaging machinery (excluding palletizers)
- Textile machinery
- Automated assembly lines
- Automatic storage and retrieval machinery
Specifications
| Safety Ratings | |
| Standards | IEC/EN 61496 Parts 1 & 2, UL 61496 Parts 1 & 2, UL 1998 |
| Safety Classification | Type 2 per IEC/EN61496. Category 2 device per EN 954-1, SIL 2 per IEC 61508, PLd per EN/ISO 13849 |
| Certifications | CE Marked for all applicable directives, UL 1998 Listed, cULus Listed, and TÜV |
| Power Supply | |
| Input Power, Max. | 24V DC ±20% |
| Maximum Residual Ripple | 0.05 Vss |
| Power Consumption | 400 mA max (no load) |
| Outputs | |
| Safety Outputs | 2 OSSDs, 0.5 A, short-circuit protected |
| Non-Safety Outputs | 1 auxiliary output, 0.5 A max. |
| Output Voltage, Min. | Uv - 2V |
| Switching Current @ Voltage, Min. | 500 mA @ 24V DC |
| Operating Characteristics | |
| Response Time | 20 ms |
| Status Indicators | On state, off state, alignment, interlock |
| Protected Height—mm (in) | 160…1760 (6.3…69.36) in 160 (6.3) increments |
| Resolution [mm (in.)] | 30 (1.18) |
| Scanning Range | 16 m (52.5 ft) |
| Synchronization | Optical, without separate synchronization channel |
| Wavelength | 870 nm |
| Environmental | |
| Enclosure Type Rating | IP65 |
| Relative Humidity | 15…95% (noncondensing) |
| Operating Temperature [C (F)] | -10…55° (14…131°) |
| Vibration | IEC 60068-2-6, frequency, 10…55 Hz Amplitude: 0.35 mm (0.01 in.) |
| Shock | IEC 60068-2-29 acceleration 10 g, pulse duration 16 ms |
| Physical Characteristics | |
| Mounting | End-cap mounting brackets |
| Weight | Varies by protective height |
| Housing Cross Section | 40 x 50 mm (1.57 x 1.96 in.) |
| Connection Type | Transmitter: 4-pin micro QD Receiver: 8-pin micro QD |
| Cable Length | 30 m (100 ft) max. |
Product Selection
Standard System
The Allen-Bradley Guardmaster GuardShield safety light curtains are ordered as pairs—transmitter and receiver—and are shipped under one part number. Each GuardShield Type 2 transmitter and receiver is packaged with two right angle mounting brackets. After selecting the appropriate light curtain pair, ensure that required interfaces and accessories are ordered.
| Resolution [mm (in.)] | Number of Beams | Protective Height—mm (in) | Pair Weight [kg (lb)] | Cat. No. | |
| Guard Only | Restart Interlock with EDM |
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| 30 (1.18) | 8 | 160 (6.3) | 0.9 (1.9) | 440L-P2KA0160YD | 440L-P2KD0160YD |
| 30 (1.18) | 16 | 320 (12.6) | 1.1 (2.4) | 440L-P2KA0320YD | 440L-P2KD0320YD |
| 30 (1.18) | 24 | 480 (18.9) | 1.6 (3.5) | 440L-P2KA0480YD | 440L-P2KD0480YD |
| 30 (1.18) | 32 | 640 (25.2) | 2.0 (4.4) | 440L-P2KA0640YD | 440L-P2KD0640YD |
| 30 (1.18) | 40 | 800 (31.5) | 2.5 (5.5) | 440L-P2KA0800YD | 440L-P2KD0800YD |
| 30 (1.18) | 48 | 960 (37.8) | 2.9 (6.4) | 440L-P2KA0960YD | 440L-P2KD0960YD |
| 30 (1.18) | 56 | 1120 (44.1) | 3.4 (7.5) | 440L-P2KA1120YD | 440L-P2KD1120YD |
| 30 (1.18) | 64 | 1280 (50.4) | 3.8 (8.4) | 440L-P2KA1280YD | 440L-P2KD1280YD |
| 30 (1.18) | 72 | 1440 (56.7) | 4.3 (9.5) | 440L-P2KA1440YD | 440L-P2KD1440YD |
| 30 (1.18) | 80 | 1600 (63.0) | 4.7 (10.4) | 440L-P2KA1600YD | 440L-P2KD1600YD |
| 30 (1.18) | 88 | 1760 (69.1) | 5.2 (11.5) | 440L-P2KA1760YD | 440L-P2KD1760YD |
| Note: The GuardShield transmitter requires a 4-pin cable and the receiver requires an 8-pin cable. | |||||
Recommended Logic Interfaces
| Description | Safety Outputs | Auxiliary Outputs | Terminals | Reset Type | Power Supply | Cat. Page No. | Cat. No. |
| Single-Function Safety Relays for 2 N.C. Contact Switch | |||||||
| MSR127RP | 3 N.O. | 1 N.C. | Removable (Screw) | Monitored Manual | 24V AC/DC | MSR127RP/TP | 440R-N23135 |
| MSR127TP | 3 N.O. | 1 N.C. | Removable (Screw) | Auto./Manual | 24V AC/DC | MSR127RP/TP | 440R-N23132 |
| MSR126 | 2 N.O. | None | Fixed | Auto./Manual | 24V AC/DC | MSR126R/T | 440R-N23117 |
| Modular Safety Relays | |||||||
| MSR210P Base 2 N.C. only |
2 N.O. | 1 N.C. and 2 PNP Solid State | Removable | Auto./Manual or Monitored Manual | 24V DC from the base unit | MSR210P | 440R-H23176 |
| MSR220 Input Module | — | — | Removable | — | 24V DC | MSR220P | 440R-H23178 |
| MSR310P Base | MSR300 Series Output Modules | 3 PNP Solid State | Removable | Auto./Manual Monitored Manual | 24V DC | MSR310P | 440R-W23219 |
| MSR320P Input Module | — | 2 PNP Solid State | Removable | — | 24V DC from the base unit | MSR320P | 440R-W23218 |
| Muting Modules | |||||||
| MSR22LM | 2 N.O. | 1 N.C. | Removable | Auto./Manual | 24V DC | MSR22LM | 440R-P23071 |
| MSR42 (requires optical interface to configure 445L-AF6150) |
2 PNP | 2 PNP, configurable | Removable | Auto./manual or manual monitored | 24V DC | MSR42 | 440R-P226AGS-NNR |
Cordsets—Two Required (one for transmitter and one for receiver)
| Female Connector (Sensor End) | Cable | Cat. No. | |||
| Face View of Female | Connector Style | Pin/Wire Color | Wire Rating | Length [m (ft)] | |
| Transmitter | |||||
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Straight Female | 1 Brown 2 White 3 Blue 4 Black |
22 AWG 300V 4 A |
2 (6.56) | 889D-F4AC-2 |
| 5 (16.4) | 889D-F4AC-5 | ||||
| 10 (32.8) | 889D-F4AC-10 | ||||
| 15 (49.2) | 889D-F4AC-15 | ||||
| 20 (65.6) | 889D-F4AC-20 | ||||
| 30 (98.4) | 889D-F4AC-30 | ||||
| Receiver | |||||
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Straight Female | 1 White 2 Brown 3 Green 4 Yellow 5 Grey 6 Pink 7 Blue 8 Red |
24 AWG 30V AC/36V DC 1.5 A |
2 (6.56) | 889D-F8AB-2 |
| 5 (16.4) | 889D-F8AB-5 | ||||
| 10 (32.8) | 889D-F8AB-10 | ||||
| 15 (49.2) | 889D-F8AB-15 | ||||
| 20 (65.6) | 889D-F8AB-20 | ||||
| 30 (98.4) | 889D-F8AB-30 | ||||
Cordsets Approximate Dimensions [mm (in.)]
Dimensions are not intended to be used for installation purposes.
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| Straight Female |
Optional Accessories
| Description | Cat. No. | |
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Steel L-shaped end cap mounting bracket (4 per package) Note: 4 brackets supplied with each GuardShield pair. |
440L-AF6101 (1 package per system) |
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Aluminum middle mounting bracket for vibratory applications | 440L-AF6108 (1 package per system) |
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Power Supply: Output 24V DC, 3 Amps, 72 W | 1606-XLP72E |
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Laser alignment tool (standard GuardShield) | 440L-ALAT |
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GuardShield laser alignment tool bracket | 440L-AF6109 |
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Mounting stand | 440L-AMSTD |
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GuardShield weld shield (cat. no. is for a pair of light curtains) | 440L-AGWS0160 |
| 440L-AGWS0320 | ||
| 440L-AGWS0480 | ||
| 440L-AGWS0640 | ||
| 440L-AGWS0800 | ||
| 440L-AGWS0960 | ||
| 440L-AGWS1120 | ||
| 440L-AGWS1280 | ||
| 440L-AGWS1440 | ||
| 440L-AGWS1600 | ||
| 440L-AGWS1760 | ||
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Vertical shock mount kit | 440L-AF6120 |
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Horizontal shock mount kit | 440L-AF6121 |
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Middle vertical mount kit | 440L-AF6122 |
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Middle horizontal mount kit | 440L-AF6123 |
Corner Mirror for Multi-Sided Guarding
Specially constructed glass mirrors for 2- and 3-sided safeguarding applications.
Note: Each mirror reduces maximum scan range by approximately 15% per mirror.
| GuardShield Light Curtain Cat. No. | Narrow Mirror Short-Range 0…4 m | Cat. No. | Wide Mirror Long-Range 4…15 m | Cat. No. |
| 440L-P2K‡ 0160YD |
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440L-AM0750300 |
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440L-AM1250300 |
| 440L-P2K‡ 0320YD | 440L-AM0750450 | 440L-AM1250450 | ||
| 440L-P2K‡ 0480YD | 440L-AM0750600 | 440L-AM1250600 | ||
| 440L-P2K‡ 0640YD | 440L-AM0750750 | 440L-AM1250750 | ||
| 440L-P2K‡ 0800YD | 440L-AM0750900 | 440L-AM1250900 | ||
| 440L-P2K‡ 0960YD | 440L-AM0751050 | 440L-AM1251050 | ||
| 440L-P2K‡ 1120YD | 440L-AM0751200 | 440L-AM1251200 | ||
| 440L-P2K‡ 1280YD | 440L-AM0751350 | 440L-AM1251350 | ||
| 440L-P2K‡ 1440YD | 440L-AM0751500 | 440L-AM1251500 | ||
| 440L-P2K‡ 1600YD | 440L-AM0751650 | 440L-AM1251650 | ||
| 440L-P2K‡ 1760YD | 440L-AM0751800 | 440L-AM1251800 | ||
‡ = A or D
Weld Shields
The GuardShield weld shields are sold as pairs in the same lengths as the protective heights of the GuardShield safety light curtain.
These polycarbonate weld shields are designed as disposable devices whose purpose is to protect the front window of the GuardShield from damage.
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| Dimensions "L"—mm (in) | Cat. No. |
| 175.3 (6.9) | 440L-AGWS0160 |
| 335.3 (13.2) | 440L-AGWS0320 |
| 495.3 (19.5) | 440L-AGWS0480 |
| 655.3 (25.8) | 440L-AGWS0640 |
| 815.3 (32.1) | 440L-AGWS0800 |
| 975.4 (38.4) | 440L-AGWS0960 |
| 1135.4 (44.7) | 440L-AGWS1120 |
| 1295.4 (51.0) | 440L-AGWS1280 |
| 1455.4 (57.3) | 440L-AGWS1440 |
| 1615.4 (63.6) | 440L-AGWS1600 |
| 1778 (70.0) | 440L-AGWS1760 |
Approximate Dimensions
Dimensions are shown in mm (in.). Dimensions are not intended to be used for installation purposes.
Safety Light Curtain
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| Type | A Protective Height [mm] |
B Mounting Value [mm] |
C Total Length [mm] |
| 440L-P2K¬ 0160YD | 160 ±0.5 | 285 | 321 ±1.5 |
| 440L-P2K¬ 0320YD | 320 ±0.5 | 445 | 481 ±1.5 |
| 440L-P2K¬ 0480YD | 480 ±0.5 | 605 | 641 ±1.5 |
| 440L-P2K¬ 0640YD | 640 ±0.5 | 765 | 801 ±1.5 |
| 440L-P2K¬ 0800YD | 800 ±0.5 | 925 | 961 ±1.5 |
| 440L-P2K¬ 0960YD | 960 ±0.5 | 1085 | 1121 ±1.5 |
| 440L-P2K¬ 1120YD | 1120 ±0.5 | 1245 | 1281 ±1.8 |
| 440L-P2K¬ 1280YD | 1280 ±0.5 | 1405 | 1441 ±1.8 |
| 440L-P2K¬ 1440YD | 1440 ±0.5 | 1565 | 1601 ±1.8 |
| 440L-P2K¬ 1600YD | 1600 ±0.5 | 1725 | 1636 ±2.0 |
| 440L-P2K¬ 1760YD | 1760 ±0.5 | 1885 | 1112 ±1.5 |
| ¬ A for Guard Only or D for Restart Interlock with EDM. | |||
Wiring Diagram for Connection of OSSDs Directly to Contactors (FSDs) fpr GuardShield Type with EDM and Restart Interlock
Wiring diagram is not intended to be used for installation purposes.
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¬ Auxiliary output is nonsafety. Can be connected to a lamp, motor or status to a PLC.
| K1, K2 | Safety relay or safety contactor for OSSD 1 and OSSD 2 connection | |
| S1 | Switch for external system test (optional) | |
| S2 | Switch for reset of light curtain from start/restart interlock |
Wiring Diagram for Connection of OSSDs Directly to a Safety Relay Module
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