HIMA Z7136 newly arrived PLC automation spare parts

Description

Z7136 The following time parameters must be taken into account for the controller’s safety

considerations:

Process safety time.

Safety time (of the resource).

Watchdog time (of the resource)

According to IEC 61508-4, the process safety time is a property of the process and describes

the time interval during which the process Z7136 allows faulty signals to exist without a hazardous

operating state occurring.

A safety-related response of the controller including all delays due to sensors, actuators, input

and output modules must occur within the process safety time.

Z7136 The Safety Time [ms] parameter tSR in the resource properties can be set in SILworX within

20…22 500 ms.

To ensure that the fault response is triggered within Z7136 the configured resource safety time, the

following requirements must be met:

The user program must respond within a RUN cycle.

No delays configured through the user program.

The Safety Time [ms] parameter tSR must be adjusted if the µP modules F 5220, F 6220 or

Z7136 are used.

If the µP modules F 5220, F 6220 or Z7136 are used, the following conditions apply to the

Safety Time [ms] parameter:

tSR

≥

4 x tWD

tSR

≥

1000 ms

tWD

≥

50 ms

tWD

Watchdog time (of the resource)

The watchdog time tWD is the maximum permissible duration of a RUN cycle (cycle time). The

controller (PES) is shut down if the cycle time exceeds the watchdog time.

The user can set the watchdog time in accordance Z7136 with the safety-related requirements of the

application.

Condition for safety:

tWD

≤

½ x tSR

tWD

Watchdog time (of the resource)

tSR

Safety Time [ms] parameter( of the resource)

Condition for safety and availability:

tWD

≤

1/3 x tSR

Z7136 The watchdog time (of the resource) must be configured. The Watchdog Time [ms] parameter

can be set within 6…7500 ms and is configured in the resource properties. The default setting is

200 ms.

The PADT checks the parameters Safety Time [ms] and Watchdog Time [ms] and rejects the

configuration while generating it if the watchdog time is greater than ½ the value of the resource

safety time.

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