Yokogawa PC-Based MX100 Bedienungsanleitung PDF herunterladen (Seite 50)

2-36

IM MX180-01E

Reference Functions and TLOG Functions

The function below are used to retrieve measured values and alarm values. The

functions are not case sensitive. For the format used to specify the <channel>, <alarm

level>, and <manual>, see “Procedure” in this section.

Function Description Example

ch(<channel>) Returns the current value of the specified channel ch(00001)/ch("Tag")

(see “Channel Number” under “Explanation” in this

section)

prech(<channel>) Returns the previous value of the specified channel prech(00001)/

(see “Channel Number” under “Explanation” in this prech("T

ag")

section)

alarm(<channel>, Returns the alarm value of the specified channel and alarm(00001,2)/

<alarm level>) specified alarm level, ON=1, OFF=0 alarm("Tag",2)

alarm(<channel>) Returns the alarm value of the specified channel, alarm(00001)/

ON=1, OFF=0 alarm("Tag")

alarm() Returns the alarm value of any channel, alarm()==1 ?

ON=1, OFF=0 StartRec() : 0

tlogmax(<channel>) Returns the maximum value of the TLOG computation tlogmax(00001)/

of the specified channel tlogmax("Tag")

tlogmin(<channel>) Returns the minimum value of the TLOG computation tlogmin(00001)/

of the specified channel tlogmin("Tag")

tlogpp(<channel>) Returns the (maximum value

– minimum value) of tlogpp(00001)/

the TLOG computation of the specified channel tlogpp("Tag")

tlogsum(<channel>) Returns the sum of the

TLOG computation of the tlogsum(00001)/

specified channel tlogsum("Tag")

tlogave(<channel>) Returns the average value of the TLOG computation tlogave(00001)/

of the specified channel tlogave("Tag")

ManualDO Returns the values being output on the specified ManualDO(1)

(<manual>) ManualDO.

ManualAO Returns the values being output on an user output ManualAO(1)

(<manual>) channel.

*1 The TLOG computation computes the maximum, minimum, maximum

–minimum, sum, and

average values of the specified channel. If the TLOG function is present in the equation, the

computation is executed

*2 The reference function or TLOG function returns NaN in the following cases.

•

When the data to be referenced by the CH function or PRECH function does not exist

(when disconnected or immediately after starting the monitor operation)

• When the specified channel does not exist or when the specified alarm level is not 1, 2, 3,

or 4.

•

If the MX100 returns an INVALID value

*3 Select the behavior taken when the value of the measurement channel is ±Over from the

following:

• Continue the calculation as ±Over (behavior when the check box is not selected)

• Continue the calculation by setting ±Over to the maximum or minimum value of the

measurement range of the specified channel.

The selection is made using the Calculate +Over/–Over as the MAX/MIN value of a range

check box.

2.5 Setting Computations (Setting the Computation Channels)

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