MTL5510B Switch/ Proximity Detector Interface 4-Channel, Multi-function, Digital Input

MTL5510B Switch/ Proximity Detector Interface 4-Channel, Multi-function, Digital Input

MTL5510B enables four solid-state outputs in the safe area to be controlled  by up to four switches or proximity  detectors  located in terminal and can switch +ve or –ve polarity signals. A range of module configurations  is available (see Table 1) through the use of selector switches.These include start/stop operations and pulse output modes.

SPECIFICATION FOR MTL5510B

See also common specification

number of channels

Line fault detection (LFD) (when selected)

User-selectable via switches on the side of the unit.

Open-circuit alarm on if Iin < 50µA

Open-circuit alarm off if Iin > 250µA

Short-circuit alarm on if Rin < 100Ω

Short-circuit alarm off if Rin > 360Ω

Note:  Resistors must be fitted when using the LFD facility with a contact input

500Ω to 1kΩ in series with switch

20kΩ to 25kΩ in parallel with switch

Safe-area outputs

Floating solid-state outputs compatible with logic circuits

Operating frequency: dc to 500Hz

Max. off-state voltage: ± 35V      Max. off-state leakage current: ± 50µA  

Max. on-state resistance: 25Ω      Max. on-state current: ± 50mA

LED indicators

Green: power indication

Yellow: four: on when output active

Red: LFD indication + faulty channel’s yellow LED flashes

Maximum current consumption

40mA at 24V (with all output channels energised)

Power dissipation within unit

0.96W at 24V, with 10mA loads

Safety description (each channel)

Uo=10.5V  Io=14mA  Po=37mW  Um = 253V rms or dc

Functional Safety Management (FSM)

Many MTL products are certified as safe for use in hazardous areas; that is places where explosive material may be present. The products are designed and certified to show that they are incapable of igniting the gas or dust and causing fire or explosion.

Another type of safety is called Functional Safety, which applies when products are used in safety and protection systems, in which a failure may mean that a protective system will not operate as it should. MTL products have been used in safety systems for some time, but there are increasing requirements to demonstrate an adequate level of functional safety, especially after the Buncefield, Texas City and Deepwater Horizon accidents. More and more, customers are demanding that products they use in safety systems meet the requirements of the second edition of the IEC 61508 Functional Safety standard, and they require evidence to show that they do. This is to enable the use of our products within instrumentation loops that are designed to achieve a specific Safety Integrity Level (SIL).

When MTL designs a product in the expectation that it will be used in functional safety-related systems, both the design process and the product needs to comply with IEC 61508:2010.

MTL has chosen to obtain Functional Safety Management (FSM) certification for the company. FSM means that MTL has the necessary processes and competence to design products according to IEC 61508:2010. Certification means that a notified body is ensuring that our processes are correct and that we are working to them. Together, FSM Certification gives our customers confidence in the company and the use of our products for functional safety.