YOKOGAWA Daqstation DX2020 User Manual

9-5
IM 04L42B01-01E
Computation and Report Functions (/M1 and /PM1 Options)
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Index
9.2 WritingExpressions
This section explains the meaning and how to write expressions.
Common Items
Follow the rules below when writing expressions.
• Useupto120characterstowriteexpressions.
• Theprecedenceofcomputingtermscanbespecifiedusingparentheses.
• Specifythechannelsintheexpressionusingchannelnumbers.
Example: 1, 12, 101, and 201
• Theone-digitnumberofconstants(K),communicationinputdata(C),remoteinput
terminal status (D), pulse input (P, Q), internal switch (S), alarm output relay status
(I), flag (F), and recording (memory sampling) status (M) in the expression can be
denoted as in “01” and “1.”
Example: K01, K1, C01, C1, D01, D1, P01, P1, Q01, Q1, S01, S1, I01, I1, F01, and F1.
• Thedataofthepreviousscanisusedinthecomputationforitsownchannelnumber
and channel numbers greater than its own channel number in the expression.
• Specialcomputation(HOLD,RESET,andCARRY)andconditionalexpressionsare
written at the beginning of the expression.
OrderofPrecedenceinComputations
The order of precedence of computation in expressions is as follows:
Type ComputingElement
(high order of precedence)
Function ABS(), SQR(), LOG(), LN(), EXP(),
TLOG.MAX(), TLOG.MIN(), TLOG.
AVE(), TLOG.SUM(), TLOG.P-P(),
CLOG.MAX(), CLOG.MIN(), CLOG.
AVE(), CLOG.SUM(), CLOG.P-P()
Special computation and conditional expression PRE, HOLD, RESET, CARRY, [a?b:c]
Power **
Logical negation NOT
Multiplication and division *, /
Addition and subtraction +, –
Greater than and less than .GT., .LT., GE., LE.
Equal and not equal .EQ., .NE.
Logical product AND
Logical sum and exclusive logical sum OR, XOR
(low order of precedence)
Limitations
The following limitations exists in writing expressions.
Type Limitations
TLOG computation A computing element cannot be written inside the parentheses.
Only one TLOG computation can be specified in a single expression.
CLOG computation
Number of channels that can be written in the parentheses is 30 channels or less.
A computing element cannot be written inside the parentheses.
Only one CLOG computation can be specified in a single expression.
PRE A computing element cannot be written inside the parentheses.
HOLD(a):b Can only be written at the beginning of an expression.
Only one HOLD computation can be specified in a single expression.
RESET(a):b Can only be written at the beginning of an expression.
Only one RESET computation can be specified in a single expression.
CARRY(a):b Can only be written at the beginning of an expression.
Only one CARRY computation can be specified in a single expression.
Only TLOG.SUM can be written in “b.”
Conditional equation
[a?b:c]
RESET, CARRY, or HOLD cannot be written to “a,” “b,” or “c.” Other computing
elements cannot be combined (example: [a?b:c]+001). However, conditional
equations can be specified for a, b, and c.

YOKOGAWA Daqstation DX2020 Specifications

General

Brand	YOKOGAWA
Model	Daqstation DX2020
Category	Recording Equipment
Language	English

Summary

Chapter 1 Overview of Functions

1.1 Input Section

Describes measurement channels, scan interval, and A/D converter integration time.

1.2 Alarms

Explains the alarm types, hysteresis, and delay functions.

1.4 Data Storage Function

Explains the types of data that the DX can record and how to store them.

1.6 Event Action and Remote Control Functions (/R1 and /PM1 Options)

Describes how specified actions are carried out when events occur.

1.7 Security Function

Explains the DX security functions, including key lock and login.

1.8 Computation and Report Function (/M1 and /PM1 Options)

Explains how to define equations in computation channels.

Chapter 3 Measurement Channels and Alarms

3.1 Setting the Scan Interval and the Integration Time of the A/D Converter

Selects the scan interval and A/D converter integration time.

3.2 Setting the Burnout Detection and the Reference Junction Compensation of the Thermocouple Input

3.3 Setting the Input Range

Sets the input range for each channel.

3.5 Setting the Auxiliary Alarm Function

3.7 Setting Alarms on Channels

Sets alarms after setting the range for each channel.

3.8 Releasing the Alarm Output (Alarm ACK Operation)

3.9 Performing Calibration Correction (/CC1 Option)

Corrects input values using segments for measured values.

3.10 Counting Pulses (/PM1 Option)

3.13 Managing the Input Calibration Interval (/CC1 option; release numbers 4 and later)

Chapter 4 Switching Operation Screens

4.1 Operations in Operation Mode

4.2 Displaying the Measured Data as Waveforms, Values, or Bar Graphs

Explains how to use trend, digital, and bar graph displays.

4.3 Displaying Past Measured Data (Historical Trend Display)

Describes five methods to display past measured data.

4.4 Display the Statuses of All Channels on One Screen (Overview Display)

4.9 Displaying a List of Operation Logs

Chapter 6 Saving and Loading Data

6.1 Setting the Recording Conditions of the Measured Data

Sets the method for recording measured data.

6.2 Setting the Method for Saving the Data

Sets the method for recording data to the storage medium.

6.3 Using the Batch Function

6.4 Starting/Stopping the Recording and Saving the Measured Data, Saving the Measured Data through Key Operation

Starts/stops recording and saves data to external storage medium.

6.5 Manually Saving the Measured Data (Manual Sample)

6.6 Saving the Screen Image Data (Snapshot)

6.7 Managing the Files on the Storage Medium

6.8 Loading and Displaying the Measured Data in the Storage Medium

6.9 Saving/Loading the Setup Data

Saves setup data to external storage or loads it from external storage.

6.10 Loading and Saving Report Templates (/M1 and /PM1 options; release numbers 4 and later)

Chapter 7 Customizing Actions Using the Event Action and Remote Control Functions (/R1 and /PM1 Options)

7.1 Setting the Event Action Function (Including the remote control function of the /R1 and /PM1 options and the USER key)

Sets actions to be performed when events occur.

7.3 Changing the Response to Remote Contact Input Opening and Closing (/R1 and /PM1 options; release number 3 or later)

Chapter 8 Using the Security Function

8.1 Disabling the Key Operation (Key Lock Function)

Disables key operations by locking the keys.

8.2 Enabling Only Registered Users to Operate the DX (Login Function)

Allows only registered users to operate the DX.

8.3 Logging in and Logging Out

Chapter 9 Computation and Report Functions (/M1 and /PM1 Options)

9.1 Setting the Expression, Measurement Range, Alarm, Tag, and Data Storage on Computation Channels

Sets computation channel expressions, ranges, alarms, tags, and data storage.

9.2 Writing Expressions

Explains the meaning and how to write expressions.

9.4 Starting/Stopping Computation, Resetting Computation, and Releasing Computation Data Dropout Display

Manages computation start/stop, reset, and data dropout display.

9.5 Creating Reports

Sets how the reports are created.

9.6 Creating a Report Template (Release numbers 4 and later)

Chapter 10 Using External Input Channels (/MC1 Option)

10.1 Setting External Input Channels

Sets external input channels for external instruments.

10.2 Displaying the External Input Channels

Chapter 11 Troubleshooting

11.1 A List of Messages

Lists possible error codes and messages displayed during operation.

11.2 Troubleshooting

Provides a flowchart for troubleshooting common issues.

Chapter 12 Calibration

12.2 Calibrating the DX

Recommends annual calibration for measurement accuracy.

Chapter 13 Specifications

13.1 Signal Input and Alarm

13.3 Data Saving Function

Details internal memory, external storage, and data formats.