Determining safety level en954-1, Output devices – Pinnacle Systems Universal Safety Controller HUB User Manual

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Page 5 of 18

Determining Safety Level

EN954-1

Category Level will determine the type of E-Stop Circuit(s)

used.

Category #2 2 Wire

Category #3 3 Wire

Category #4 4 Wire

Solid-State Output Light Curtains can use the 2 Wire

configuration in a Category #4 installation as long as

the Light Curtains Outputs are Self-Checking. (The

Microguard Model SS Light Curtain has Self-Checking

Outputs)

Output Devices

Channel C1-3 and Channel D1&2 are the only Safety

Output Devices.

Latching Relay Output.

To force a Safety Output

Channel to latch upon opening of any Safety device, you

must add a RST Button device. To then Reset a Safety

Output Channel, you must cycle the RST Button (see .....

diagram for wiring example).

External Device Monitoring (EDM).

EDM is

required if you want to add external mechanical Safety

Relays to either Channel C or Channel D. Most likely EDM

will find use with Channel D, since Channel C already has

monitored Safety Relays built in.

EDM is wired in series through N.C. Contacts of both

external Safety Relays. EDM inputs should be closed

when the output is OFF (open). The EDM inputs should be

open when the Output is ON (closed). (see .... diagram

for wiring example)

Status Outputs.

Solid-State Channel E outputs 1-8

provide non-safety status. Channel E1 is always indicating

the Status of Output Channel D. (E1 on = Channel D on).

The remaining 7 outputs can be tied to any particular Input

Device. The Auxiliary Dry contact Channel C4 output can

be used as a status Channel C.

Auxiliary Channel C4 Dry Relay Contact.

non-monitored form C N.O. & N.C. dry 5A relay contact

is provided as Channel C4 and can be used to indicate

status of the Channel C outputs.

Timers.

Use a Timer to hold an output On or Off for a

user programmable amount of time. See Page 12 of 18

for Timer programming.

The five categories range from the simplest category “B” through to category
“1” up to category “4” this being the most stringent in acknowledgment of the
higher risk anticipated.

British Standard publishes a category assessment chart in BS EN 954-1
based on the factors above.
The following assessment chart extracted from BS EN 954-1 determines the
category.

Key

Categories

�

Severity of injury – Slight (i.e. cut or bruise)

Severity of injury – Serious (i.e. hospital treatment to fatal)

Frequency of exposure to hazard – seldom or often but short exposure

Frequency of exposure to hazard – continuous or frequent with long exposure

Possibility of avoiding hazard – possible or slow moving hazard

Possibility of avoiding hazard – not possible or fast moving hazard

Possible category requiring further measures

�

Preferred category

Measures exceeding requirements for risk involved

The five categories range from the simplest category “B” through to category
“1” up to category “4” this being the most stringent in acknowledgment of the
higher risk anticipated.

British Standard publishes a category assessment chart in BS EN 954-1
based on the factors above.
The following assessment chart extracted from BS EN 954-1 determines the
category.

Key

Categories

�

Severity of injury – Slight (i.e. cut or bruise)

Severity of injury – Serious (i.e. hospital treatment to fatal)

Frequency of exposure to hazard – seldom or often but short exposure

Frequency of exposure to hazard – continuous or frequent with long exposure

Possibility of avoiding hazard – possible or slow moving hazard

Possibility of avoiding hazard – not possible or fast moving hazard

Possible category requiring further measures

�

Preferred category

Measures exceeding requirements for risk involved

Severity of injury – Slight (i.e. cut or bruise)

Severity of injury – Serious (i.e. hospital

treatment to fatal)

Frequency of exposure to hazard – seldom or

often but short exposure

Frequency of exposure to hazard – continuous

or frequent with long exposure

Possibility of avoiding hazard – possible or

slow moving hazard

Possibility of avoiding hazard – not possible or

fast moving hazard

Possible category requiring further measures

Preferred category

Measures exceeding requirements for risk

involved

The five categories range from the simplest category “B” through to category
“1” up to category “4” this being the most stringent in acknowledgment of the
higher risk anticipated.

British Standard publishes a category assessment chart in BS EN 954-1
based on the factors above.
The following assessment chart extracted from BS EN 954-1 determines the
category.

Key

Categories

�

Severity of injury – Slight (i.e. cut or bruise)

Severity of injury – Serious (i.e. hospital treatment to fatal)

Frequency of exposure to hazard – seldom or often but short exposure

Frequency of exposure to hazard – continuous or frequent with long exposure

Possibility of avoiding hazard – possible or slow moving hazard

Possibility of avoiding hazard – not possible or fast moving hazard

Possible category requiring further measures

�

Preferred category

Measures exceeding requirements for risk involved

The five categories range from the simplest category “B” through to category
“1” up to category “4” this being the most stringent in acknowledgment of the
higher risk anticipated.

British Standard publishes a category assessment chart in BS EN 954-1
based on the factors above.
The following assessment chart extracted from BS EN 954-1 determines the
category.

Key

Categories

�

Severity of injury – Slight (i.e. cut or bruise)

Severity of injury – Serious (i.e. hospital treatment to fatal)

Frequency of exposure to hazard – seldom or often but short exposure

Frequency of exposure to hazard – continuous or frequent with long exposure

Possibility of avoiding hazard – possible or slow moving hazard

Possibility of avoiding hazard – not possible or fast moving hazard

Possible category requiring further measures

�

Preferred category

Measures exceeding requirements for risk involved