7 process control, Start, Stop – Metrohm 788 IC Filtration Sample Processor User Manual

Page 93

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4.3 Methods

788 IC Filtration Sample Processor

4.3.7 Process

control

START

With

<START> a method is started from the normal state. If there is no

manual intervention or unexpected errors, the sample series is correctly

processed and closed with the final sequence. The sample sequence is

executed repeatedly according to the entry under

'number of sam-

ples'

, beginning with the sample tube that is defined as

'SAMPLE'

STOP

If the sample series is interrupted with

<STOP>, the 788 IC Filtration

Sample Processor returns immediately to the normal state. Samples

that have not been processed are ignored and the end sequence is not

executed. If settings for such instances have been activated under

'manual stop options'

, the corresponding actions or commands are

also executed via the interfaces to stop instruments that are connected

or to initiate other actions.

HOLD

LEARN

With

<HOLD> the processing of a method can be interrupted. The

command that is active at this point is immediately interrupted as a re-

sult. <START> continues the active sequence beginning with the

command immediately following the one interrupted. Any peripheral in-

strument connected is

not stopped with the <HOLD> key.

RESET

CLEAR

<CLEAR> interrupts a sample series at the end of a currently active

sequence (soft break). The sample currently being processed will be

completed.

QUIT

<QUIT> interrupts the command currently being executed and starts

the next command line in the sequence.

If errors occur during the sample series, the corresponding

error mes-

sage is displayed and must be acknowledged with <QUIT>. The 788

IC Filtration Sample Processor then goes into the HOLD status (see

above). After remedying the error, <START> resumes the sequence or

<STOP> halts it entirely.

During the course of a method it is possible to change all entries in the

menus

'>configuration'

and

'>parameters'

. These changes have an

immediate effect on the course of the method (with few exceptions, see

section 4.2.1).

Care should be taken when editing process sequences. These can be

edited "live" (including insertion or deletion of a command line). The

TRACE and LEARN functions however, are not available in this case.

Testing of the edited function is therefore not possible. Illogical com-

mand sequences could easily result, which would cause an error

condition and force the interruption of a sample series.

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