PICO-GUARD Fiber Optic System—Controllers
Overview
Four separate optical sensing channels monitor one or multiple Fiber Optic Switches, Point, Grids or Optical E-Stop Buttons in the same fiber optic loop.
- Flexible and easy to install, the controller is a low-cost alternative to cumbersome and costly methods required for machine safeguarding.
- Each of the four channels controls multiple inputs, to protect personnel from hazardous equipment and to protect critical tooling or materials in process.
- Controller signals the machine control circuit to stop when the system detects a loss in light signal or receives a safety stop request from its Universal Safety Stop Interface (USSI) input.
- Each channel can control several fiber optic Safety Interlock Switches in the same fiber loop.
- Each channel can monitor a separate part of a machine, such as doors, entry gates and sensors.
- USSI connects multiple PICO-GUARD Controllers and other safety devices in a single safety circuit, when required.
- Controllers are available with optical channel auxiliary outputs and muting.
- Fiber optic safety interlocks are available to solve numerous applications and include Grids, Points and Interlock Switches.
- Diverse-redundant and self-checking design exceeds control reliability and meets Safety Category 4 per ISO 13849 (EN 954-1) and IEC 61496-1 Type 4 requirements.
Product Specifications
| System Power Requirement* | 24V dc ±15% (SELV), 10% max. ripple; 250 mA max., exclusive of output loads. *External supply must be in accordance with IEC 61558 (EN 60742). |
|---|---|
| Short Circuit Protection | All inputs and outputs are protected from short circuits to +24V dc or dc common |
| Response Time | Optical channel:13 milliseconds max. Time between the opening of optical switch and the OSSD safety outputs turning off.) USSI inputs:7 milliseconds max. (Time between actuation of the safety stop input device and the OSSD safety outputs turning off.) |
| Safety Rating | Type 4 per IEC 61496-1; Category 4 per ISO 13849-1 (EN 954-1) |
| External Device Monitoring (EDM) Input | Two inputs for external device monitoring (EDM). Each input monitors the status of a normally closed, forced-guided monitor contact of an external safety device or MPCE. The EDM inputs must be high (10 to 30V dc) when the external device or MPCE is OFF, and must be low (less than 3V dc) when the external device or MPCE is ON. External devices or MPCEs must meet certain timing requirements, depending on the configuration setting. |
| System Reset Input | The Reset input must be high (10 to 30V dc) for 0.25 to 2 seconds and then low (less than 3V dc) to reset the system from a manual power-up, optical channel latch or system lockout condition. |
| USSI 1 Reset Input | SFCDT-4A1 and SFCDT-4A1C:The Reset input must be high (10 to 30V dc) for 0.25 to 2 seconds and then low (less than 3V dc) to reset the system from a USSI 1 latch condition. SFCDT-4A1CM1:Universal Safety Stop Interface (USSI) input is not available. |
| USSI 1 Input | SFCDT-4A1 and SFCDT-4A1C:Dual-channel, redundant inputs for monitoring output contacts or “handshake” compatible safety solid-state outputs of other safety stop devices. OFF (stop) signals cause the PICO-GUARD OSSDs to latch OFF (Latch condition). SFCDT-4A1CM1:Universal Safety Stop Interface (USSI) input is not available. |
| USSI 2 Input | SFCDT-4A1 and SFCDT-4A1C:Dual-channel, redundant inputs for monitoring output contacts or “handshake” compatible safety solid-state outputs of other safety stop devices. OFF (stop) signals cause the PICO-GUARD OSSDs to turn OFF (Trip condition). SFCDT-4A1CM1:Universal Safety Stop Interface (USSI) input is not available. |
| Safety Outputs | Two redundant solid-state 24V dc, 0.5 A max. sourcing OSSD (Output Signal Switching Device) safety outputs. (Use optional interface modules for ac or larger dc loads.) Capable of the Banner “Safety Handshake” ON-state voltage:Vin-1.5V dc max. OFF-state voltage:1.2V dc max. Max. load resistance:1,000 ohms Max. load capacitance:0.1 µF OSSD test pulse width:100 to 300 microseconds OSSD test pulse period:6 milliseconds |
| Non-Safety Outputs | Solid-state 24V dc (Vin-1.5V dc max.), 0.25 A max. sourcing (PNP) non-safety outputs
SFCDT-4A1:Aux., Weak Signal, Fault SFCDT-4A1C:Aux., Weak Signal, Fault, Ch1-4 SFCDT-4A1CM1:Aux./Mute Lamp, Mute Lamp, Fault, Ch1-4 |
| Muting Device Inputs | SFCDT-4A1CM1:The muting devices work in pairs (MS1 and MS2, MS3 and MS4) and are required to be “closed” within 3 seconds of each other (simultaneity requirement) to initiate mute (assuming all other conditions are met). SFCDT-4A1 and SFCDT-4A1C:Muting is not available. |
| Mute Enable Input | SFCDT-4A1CM1:When Mute Enable is selected (functional), this input must have +24V dc applied in order to start a mute; opening this input after mute has begun has no effect. SFCDT-4A1 and SFCDT-4A1C:Muting is not available. |
| Remote Status Interface | Isolated RS-232 non-safety output (4800 Baud rate) for setup or monitoring the system status. Connections provided for a Remote Display unit |
| Controls and Adjustments | SFCDT-4A1 and SFCDT-4A1C:Redundant switches for Auto/Manual power-up, Trip/Latch output operation and 1- or 2-channel EDM operation. Redundant switches for ON/OFF of each optical channel. (NOTE: At least one optical channel must be ON.) SFCDT-4A1CM1:Redundant switches for Auto/Manual power-up, Trip/Latch output operation and 1- or 2-channel EDM operation. Redundant switches for ON/OFF of two optical channels. (2 and 4; channels 1 and 3 are always enabled). Redundant switches for muting configuration. |
| Ambient Light Immunity | Less than 10,000 lux @ 5° angle of incidence |
| Strobe Light Immunity | Totally immune to one Federal Signal Corp. “Fireball” model FB2PST strobe |
| Emitter Element | Visible red LED, 660 nm at peak emission |
| Status Indicators | SFCDT-4A1 and SFCDT-4A1C: System Status (bicolor Red/Green):overall status of the PICO-GUARD system
System Reset (bicolor Yellow/Red):status of the input; indicates system reset needed
Channel (4 bicolor Red/Green):each shows the status of one optical channel
USSI (2 bicolor Red/Green):status of the USSI input channels (a-b and c-d)
USSI 1 Reset (bicolor Yellow/Red):status of USSI 1 reset input; indicates USSI 1 reset needed
EDM (2 bicolor Red/Green):status of the EDM input channels
OSSD (2 bicolor Red/Green):status of the OSSD outputs
Config (bicolor Red/Green):status of the system configuration
SFCDT-4A1CM1:System Status (bicolor Red/Green):overall status of the PICO-GUARD system
System Reset (bicolor Yellow/Red):status of the input; indicates system reset needed
Channel (4 bicolor Red/Green):each shows the status of one optical channel
Muting (4 bicolor Red/Green):status of the muting input
Mute Enable (bicolor Yellow/Red):status of mute enable
EDM (bicolor Red/Green):status of the EDM input channels
OSSD (bicolor Red/Green):status of the OSSD outputs
Config (bicolor Red/Green):status of the system configuration
|
| Enclosure Rating | IEC IP20 |
| Operating Conditions | Temperature:0° to +50° C Relative humidity:95% max. (non-condensing) |
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