Страница 10: ДСТУ EN 50131-1:2014. Alarm Systems - Intrusion and Hold-Up Systems - Part 1: System Requirements (61223)

Attention: In this document references in italics refer to parts of EN 50131-1:200

68.5.2 Availability of indications [Indications at access level 1] (Table 9)

Table 9 lists all of the indications available to observers of the system who have not identified themselves to the l&HAS (i.e. a user at access level 1). No other indications are available. The requirements of Table 9 are in some cases overridden by other clauses of EN 50131-1:2006. The following describes each item of Table 9.

Table 4 - Clarification for Table 9

8.5.4 Indication - Intrusion detectors

The aim of the requirement is that the IAS shall be capable of assisting users to identify the detector that generated the alarm condition. As examples, a PIR movement detector has processing capability and so that individual detector shall be identifiable by the IAS. A simple magnetic contact detector does not normally have processing capability.

The indication referred to in 8.5.4 is not included in Table 9 and must therefore not be visible to unauthorised (access level 1) users

8.6 Notification [Notification equipment] (Tables 10 and 11)

Table 10 specifies the minimum l&HAS configuration(s) for means of notification.

Manufacturers of CIE should provide the necessary interfaces to meet at least one of the options. That is the CIE should provide outputs for causing alarm transmission or activating warning devices and inputs for monitoring such equipment or alternatively such devices should be combined with the CIE.

Warning Devices (WD)

EN 50131-1:2006 specifies two categories of audible WD. They may be “Remotely powered” meaning that the WD does not contain a power supply to generate the sound and will therefore not sound if disconnected from the power source. The alternative type is “Self-powered” which means that the sound can be generated using a power supply within the WD. “Self-powered” WD may usually be powered from elsewhere, e.g. the CIE (to prevent discharge of batteries).

Alarm Transmission Equipment (ATE)

Table 10 refers to the performance criteria of alarm transmission systems using values ATS 1 to ATS 6. The scope of EN 50131-1:2006 is restricted to systems and components installed in or mounted on the exterior of the supervised premises (see Clause 1). The alarm transmission system (ATS) however extends from the supervised premises to the ARC and includes items of alarm transmission equipment (ATE) installed in both buildings. EN 50131-1:2006 therefore only gives requirements for the ATE installed at the supervised premises. The ATE satisfies the l&HAS requirements if it is capable of achieving the performance criteria stated in Table 10 when connected to a suitable transmission network.

NOTE There may be additional requirements for the ATS to meet certain requirements of EN 50136-1-1:1998 but these do not form part of EN 50131-1:2006.

I&HAS: EN 50131 series

Requirements concerning means of notification belong to 50131 series

Requirements concerning ATS (including ATE) belong to 50136 series

Figure 2 - Relationship of ATS and l&HAS

The reason why Table 10 refers to ATS instead of ATE is because (at the time of its writing) there were no grade dependent requirements for ATE in any part of the EN 50131 or EN 50136 series. To differentiate the requirements for each grade the ATS performance criteria was used. The ATS rating (e.g. ATS 4) in Table 10 refers to the criteria given in Table 11. The ATS ratings in Table 11 are a selection from the generic performance criteria specified in EN 50136-1-1:1998 considered appropriate to l&HAS. These are summarised in EN 50131-1:2006, Annex B.

Note that EN 50136-1-1:1998 refers to an “Availability Classification” but EN 50131-1:2006 does not include requirements relating to availability.

It is recognised that in addition to tests of individual components it may be necessary to perform a test for type approval of an l&HAS ¹⁾. If this is done then, although EN 50131-1:2006 includes specification of the ATS performance rating, it is not mandatory to test the ATS as part of the l&HAS type approval test. Separate testing of the ATS should be in accordance with the EN 50136 series of standards.

This may be required in some countries, particularly during the period prior to publication of relevant component standards (which at present are available as Technical Specifications, draft versions, or are not available)

EN 50131-1:2006 gives overall requirements for tamper security and states these requirements “may vary” and protection should be “appropriate” It is not necessary to imply additional requirements because of these phrases. The detailed requirements and tests related to tamper security are described in the component standards.

NOTE Subclause 5.7 of EN 50136-2-1:1998 includes certain requirements for the protection of ATE including a phrase requiring the protection to be “the same as or higher than those of the associated alarm system”. Such requirements are found in the EN 50131 series component standards (for example CLC/TS 50131-3:2003).

The note in Table 16 describes the monitoring of RF frequencies for jamming and monitoring of interconnection buses for a similar lack of availability. In the case of a bus, this problem is most likely to occur with non-specific wired interconnections, as the result of a fault condition or because of an attempt to tamper the interconnection. Although this check can be performed at grades 3 and 4, the interconnection would simultaneously exceed the verification intervals for the interconnection integrity of 8.8.4.1 and Table 17.

A similar approach could satisfy the requirements at grades 1 and 2 but this might not be the optimum method. In most cases, the easiest way to check that the interconnection is available is to monitor it and check for sufficiently long periods (determined by the interconnection design) when it is not carrying a message.

The communication referred to in 8.8.4.1 refers to each individual component of the system whereas the communication in 8.8.4.2 refers to any component (i.e. prior to setting at least one component must have successfully sent a signal or message within the period of Table 18. All components must have done so within the period of Table 17).

The time from detection of a condition (e g. a detector detects intrusion) until the notification device is activated must not exceed 20 seconds. This is 10 seconds from 8.8.1 (maximum time allowed for the signal or message to go from the detector to the point of processing) plus a further 10 seconds. This further 10 seconds is the time in 8.9.2 concurrent with 10 seconds from 8.8.1 (maximum time for the signal or message to go from the point of processing to the notification device).

Grades 2, 3 and 4 l&HAS shall possess some method of recording the events that have occurred for the purposes of fault diagnosis, proof of operation and forensic investigation. At grade 1 all aspects of the event record are optional.

Storage of events (Table 21)

Table 21 specifies the minimum length of time that the contents of the event record must remain uncorrupted in the complete absence of power (for example, after the end of the standby power supply period when the AC supply is disconnected). During this time, reconnecting power should enable recovery of all event records up to the time when power was lost.

The memory capacity stated in Table 21 is the minimum number of the mandatory events listed in Table 22 that can be simultaneously stored. If optional events are to be stored, they should not reduce the number of mandatory events recorded. How this is achieved is not specified by the standard (typically, larger storage would be provided or optional events deleted to prioritise storage). For example, if a grade 3 l&HAS with storage for 750 events also recorded the opening of a door in the unset state and the door was opened 251 times then some arrangement must be made to protect the storage of 500 mandatory events.

The deletion of stored events is only allowed under the automatic control of the l&HAS in order to store more recent events. There must not be a facility for users to delete records.

The standard requires that at least three events but no more than ten events shall be recorded from “a single source" during any set or unset period. This is to prevent the storage from being filled by repetitive events. A “single source" means one identifiable location (e g. a detector) and the requirement applies to the same type of event. For example if twelve detectors employ a single tamper circuit but individual intrusion alarm circuits then no more than ten tamper signals should be recorded but an intrusion alarm could then be recorded from each detector in turn. The count is cleared when the l&HAS is set or unset.

Events to be recorded (Table 22)

Table 5 - Interpretation of some items of Table 22

When Table 22 lists the start of a condition as mandatory, it is recommended that the subsequent removal of that condition should also be recorded. For example, “intrusion detector isolated” is listed but not “removal of intrusion detector isolation". Failure to do this would result in the event record apparently showing repeated failures without recovery.

Although Table 22 states that the optional or mandatory nature of an event record is dependent upon the grade of the l&HAS, any event listed as mandatory in a higher grade can be considered as mandatory in a lower grade for the purposes of determining the deletion or protection of events as described above. For example, if “Prime Power Source Fault” is recorded by a grade 2 IAS then it is not required to delete that record for the purposes of storing an event listed as mandatory at grade 2 in Table 22 This permits the use of grade 3 CIE within a grade 2 l&HAS without additional configuration.

Recording events outside the l&HAS

Transfer of the event record to the ARC is useful but it is recommended that this is used in addition to storage within the l&HAS. This may be particularly useful if a system records a large number of optional events. Storage within the l&HAS is always required and should comply with the requirements stated in 8.10.

The intention of the note in 8.10 is to recommend that recording at the ARC should provide storage meeting the clause requirements for each connected system.

Permanent record of events

Grades 3 and 4 l&HAS shall offer a facility to transfer the contents of the event record to another format or system with greater endurance. Examples could be a print copy, electronic or optical storage. This could be achieved locally or by transmission to a remote location. It is only the transfer facility that is required not the means of printing or storage.

9 Power supply

For a full understanding of power supply requirements it is recommended that EN 50131-6 is read.

Any power supply that consists entirely of finite capacity power sources (such as batteries) should be considered to be a type C power supply. Type C power supplies should be capable of providing the necessary power for a minimum of one year following installation of the storage device.

It is recognised that the change over from the prime power source to alternative power source will be accompanied by the existence of a prime power source fault condition but the change over should not cause spurious alarm conditions.