Wika T53 Uživatelský manuál stáhnout pdf (Strana 6)

1.7 FEATURES / FEATURE_SEL parameters

The bit strings FEATURES and FEATURE_SEL determine optional behaviour of the resource.

The first defines the available features, and is read only. The second is used to turn on an

available feature by configuration. If a bit is set in FEATURE_SEL that is not set in FEA

TURES, the result will be a block alarm for a configuration error. The device supports the

following features: Reports supported, Fault State supported, Soft Write lock supported.

1.8 Fault state for the whole resource

If the user sets the SET_FSTATE parameter, the FAULT_STATE parameter will indicate active

and it will cause all output function blocks in the resource to go immediately to the condition

chosen by the fault state Type I/O option. It may be cleared by setting the CLR_FSTATE pa

rameter. The set and clear parameters do not appear in a view because they are momentary.

1.9 Write lock by software

The WRITE_LOCK parameter, if set, will prevent any external change to the static or non

volatile data base in the Function Block Application of the resource. Block connections and

calculation results will proceed normally, but the configuration will be locked. It is set and

cleared by writing to the WRITE_LOCK parameter. Clearing WRITE_LOCK will generate the

discrete alert WRITE_ALM, at the WRITE_PRI priority. Setting WRITE_LOCK will clear the

alert, if it exists. Before setting WRITE_LOCK parameter to Locked, it is necessary to select

the “Soft Write lock supported” option in FEATURE_SEL.

1.10 Features being implemented

The parameter CYCLE_TYPE is a bit string that defines the types of cycles that this resource

can do. CYCLE_SEL allows the configurator to choose one of them. If CYCLE_SEL contains

more than one bit, or the bit set is not set in CYCLE_TYPE, the result will be a block alarm

for a configuration error. MIN_CYCLE_T is the manufacturer specified minimum time to ex

ecute a cycle. It puts a lower limit on the scheduling of the resource.

MEMORY_SIZE declares the size of the resource for configuration of function blocks, in kilo

bytes. The parameter FREE_SPACE shows the percentage of configuration memory that is

still available. FREE_TIME shows the approximate percentage of time that the resource has

left for processing new function blocks, should they be configured.

1.11 BLOCK_ERR

The BLOCK_ERR of the resource block will reflect the following causes:

Device Fault State Set – When FAULT_STATE is active.

Simulate Active – When the Simulate jumper is ON.

Out of Service – When the block is in O/S mode.

1.12 Supported Modes

O/S, IMAN and AUTO

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Wika T53 Uživatelský manuál Strana 6