Omega DRST-AC User Manual

TM

User’s Guide

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DRST-AC

Din Rail AC Transmitter

omega.com [e-mail]

Servicing North America:

U.S.A. Omega Engineering, Inc.
Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [e-mail]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.

Table of

Contents

DRST-AC MV Transmitter

Table of Contents

Section ........................................................................ Page

Section 1 Warning .......................................................................................... 5

Section 2 Safety Instructions ........................................................................ 6

Section 3 How to demount DRST Series ................................................... 7

Section 4 Universal AC/DC transmitter ..................................................... 8

Section 4.2 Application .................................................................. 8

Section 4.3 Technical characteristics ............................................ 8

Section 4.4 Mounting / installation / programming ................ 8

Section 5 Signals/Connection ....................................................................... 9

Section 5.1 Input Signals ............................................................... 9

Section 5.2 Output Signals ............................................................ 9

Section 5.3 Power Connection ...................................................... 9

Section 6 DRSL-DISPLAY/programming front ...................................... 10

Section 8.1 Mounting / demounting the DRSL-DISPLAY .... 10

Section 7 Order ....................................................................................... 11-13

Section 7.1 Specications ............................................................. 13

Section 8 Congurable input error indication & input limits ....... 14-15

Section 9 DRSL-DISPLAY display readout ............................................. 16

Section 10 Connections ................................................................................. 17

Section 11 Block Diagram ............................................................................. 18

Section 12 Configuration / Operating the function keys ........................ 19

Section 13 Routing Diagram ................................................................... 21-26

Section 13.2 Advanced settings .................................................. 25

Section 13.3 Help text overview ................................................. 25

Section 13.4 Document history ................................................... 26

3

6 Product Pillars
to meet your every need

Individually outstanding, unrivalled in combination

With our innovative, patented technologies, we make signal conditioning smarter and simpler. Our portfolio is composed
of six product areas, where we offer a wide range of analog and digital devices covering over a thousand applications in
industrial and factory automation. All our products comply with or surpass the highest industry standards, ensuring
reliability in even the harshest of environments and have a 5-year warranty for greater peace of mind.

Our range of temperature transmitters and sensors provides the highest level of signal integrity from the
measurement point to your control system. You can convert industrial process temperature signals to analog,
bus or digital communications using a highly reliable point-to-point solution with a fast response time,
automatic self-calibration, sensor error detection, low drift, and top EMC performance in any environment.

We deliver the safest signals by validating our products against the toughest safety standards. Through our
commitment to innovation, we have made pioneering achievements in developing I.S. interfaces with SIL 2 Full
Assessment that are both efficient and cost-effective. Our comprehensive range of analog and digital
intrinsically safe isolation barriers offers multifunctional inputs and outputs, making Omega an easy-to­implement site standard. Our backplanes further simplify large installations and provide seamless integration
to standard DCS systems.

We provide inexpensive, easy-to-use, future-ready communication interfaces that can access your installed base
of products. The detachable DRSL-DISPLAY Local Operator Interface (LOI) allows for local monitoring of
process values, device configuration, error detection and signal simulation. The next generation, our DRST-CM
Remote Operator Interface (ROI) does all that and more, adding remote digital communications via Modbus/
RTU, while the analog output signals are still available for redundancy.
With the DRST-CM you can further expand connectivity with a gateway, which connects via industrial
Ethernet, wirelessly through a Wi-Fi router.

Our unique range of single devices covering multiple applications is easily deployable as your site standard.
Having one variant that applies to a broad range of applications can reduce your installation time and training,
and greatly simplify spare parts management at your facilities. Our devices are designed for long-term signal
accuracy, low power consumption, immunity to electrical noise and simple programming.

Our compact, fast, high-quality 6 mm isolators are based on microprocessor technology to provide exceptional
performance and EMC-immunity for dedicated applications at a very low total cost of ownership. They can be
stacked both vertically and horizontally with no air gap separation between units required.

Our display range is characterized by its flexibility and stability. The devices meet nearly every demand for
display readout of process signals, and have universal input and power supply capabilities. They provide a real­time measurement of your process value no matter the industry, and are engineered to provide a user-friendly
and reliable relay of information, even in demanding environments.

1

GENERAL

HAZARD OUS

VOLTAGE

Warning

WARNING

This device is designed for connection to hazardous electric voltages. Ignoring this
warning can result in severe personal injury or mechanical damage.
To avoid the risk of electric shock and fire, the safety instructions of this guide must be
observed and the guidelines followed. The specifications must not be exceeded, and
the device must only be applied as described in the following.
Prior to the commissioning of the device, this installation guide must be examined
carefully.
Only qualified personnel (technicians) should install this device. If the equipment is
used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired.

WARNING

Until the device is fixed, do not connect hazardous voltages to the device. The
following operations should only be carried out on a disconnected device and under
ESD safe conditions:
General mounting, connection and disconnection of wires.
Troubleshooting the device.

Repair of the device and replacement of circuit breakers must be done by
Omega A/S only.

Do not open the front plate of the device as this will cause damage to the connector for the
display / programming front DRSL-DISPLAY.
This device contains no DIP-switches or jumpers.

CAUTION

DRST Series must be mounted on a DIN rail according to DIN EN 60715.

Section 1.2 - Symbol Identification

Triangle with an exclamation mark: Read the manual before installation
and commissioning of the device in order to avoid incidents that could lead
to personal injury or mechanical damage.

The CE mark proves the compliance of the device with the essential
requirements of the directives.

WARNING

The double insulation symbol shows that the device is protected by double
or reinforced insulation.

5

2

Safety Instructions

Section 2 - Safety instructions

Definitions

Hazardous voltages have been defined as the ranges: 75 to 1500 Volt DC, and 50 to 1000 Volt AC.
Technicians are qualified persons educated or trained to mount, operate, and also trouble-shoot technically correct and in
accordance with safety regulations.
Operators, being familiar with the contents of this manual, adjust and operate the knobs or potentiometers during normal
operation.

Receipt and unpacking

Unpack the device without damaging it and check whether the device type corresponds to the one ordered. The packing should
always follow the device until this has been permanently mounted.

Environment

Avoid direct sun light, dust, high temperatures, mechanical vibrations and shock, and rain and heavy moisture. If necessary,
heating in excess of the stated limits for ambient temperatures should be avoided by way of ventilation.
The device must be installed in pollution degree 2 or better.

Mounting

Only technicians, who are familiar with the technical terms, warnings, and instructions in the manual and who are able to
follow these, should connect the device. Should there be any doubt as to the correct handling of the device, please contact our
Omega tech support.

Mounting and connection of the device should comply with national legislation for mounting of electric materials, i.e. wire cross
section, protective fuse, and location.

Descriptions of input / output and supply connections are shown in the block diagram and side label.

The following apply to fixed hazardous voltages-connected devices:

The max. size of the protective fuse is 10 A and, together with a power switch, it should be easily accessible and close to the
device. The power switch should be marked with a label indicating that it will switch off the voltage

to the device.

Year of manufacture can be taken from the first two digits in the serial number.

UL installation requirements

Use 60/75°C copper conducters only

For use only in pollution degree 2 or better

Max. ambient temperature 60°C

Max. wire size AWG 26-14

UL file number E248256

Calibration and Adjustment

During calibration and adjustment, the measuring and connection of external voltages must be carried out according to the
specifications of this manual. The technician must use tools and instruments that are safe to use.

Normal operation

Operators are only allowed to adjust and operate devices that are safely fixed in panels, etc., thus avoiding the danger of
personal injury and damage. This means there is no electrical shock hazard, and the device is easily accessible.

Cleaning

When disconnected, the device may be cleaned with a cloth moistened with distilled water.

Liability

To the extent the instructions in this manual are not strictly observed, the custom er cannot advance a demand against
Omega A/S that would otherwise exist according to the concluded sales agreement.

6

Section 3 - How to demount DRST-AC

Picture 1:

The device is detached from the DIN rail by moving the bottom lock down.

How to demount DRST Series

3

When front LED flashes red or DRSL-DISPLAY display shows AO.ER

The DRST-AC is designed with a high safety level. Therefore, the device continuously
measures the output current. If “S4-20” is selected during configuration, and output
current drops to 0 mA, the DRSL-DISPLAY display will indicate “AO.ER” and the
front LED will turn red. (A 0 mA output can be caused by an open output loop). The
error mode can be reset by power cycling the device or stepping through the menu.

7

4

Universal AC/DC transmitter

Section 4.1 - Universal AC/DC transmitter

• Measures AC current and voltage signals and converts these into uni-/bipolar DC current and voltage signals ~

• Outputs passive or active current signals

• Programming, process monitoring and diagnostics via DRSL-DISPLAY

• Response time < 0.75 s and excellent accuracy better than 0.3%

• Universally powered by 21.6…253 Vac / 19.2...300 Vdc

Application

• The 0... 5 AAC range makes it possible to accurately measure a typical current transformer.

• The 0...300 VAC range allows accurate supply voltage monitoring.

• The DRST-AC measures standard input ranges, and can be freely configured to customer-defined input range.

• Converts narrow AC current / voltage inputs to wide bipolar or unipolar outputs, e.g. 0…1 VAC input = ±10 volt or 4...20 mA
output with a minimum span of 0.5 AAC or 0.5 VAC.

• The detachable DRSL-DISPLAY displays provide enhanced diagnostics.

• Configurable input limits control the output value for increased safety.

Technical characteristics

• The latest analog and digital techniques are used to obtain maximum accuracy and immunity to interference.

• Possibility of output safety readback by selecting S4...20 mA output.

• Response time < 0.75 s for measuring AC current / voltage signals.

• The current output can drive up to 800 Ohms, with an adjustable response time of 0.0…60.0 seconds.

• Exceptional mA output load stability of < 0.001% of span / 100 Ohm.

• Meets the NAMUR NE21 recommendations, ensuring high accuracy in harsh EMC environments.

• Meets the NAMUR NE43 recommendations, allowing the control system to easily detect an input error.

• Each unit is tested to a high 2.3 kVAC, 3-port galvanic isolation level.

• Excellent signal to noise ratio of > 60 dB.

Mounting / installation / programming

• Very low power consumption means units can be mounted side by side without an air gap – even at 60°C ambient temperature.

• Configuration, monitoring, 2-point process calibration and more are accomplished using either the DRSL-DISPLAY detachable
display or the DRST-CM detachable digital communication enabler.

• All programming can be password-protected.

8

Section 5.1 - signals:

Current Voltage

Signals/Connection

44

43

5

(N)

Section 5.2 - Output signals:

(N)

Current & voltage

12

14

+

13

11

42

41

10 V

1 V

+

10 V

1 V

++

+ V supply

2-wire

(±)

}

Section 5.3 - Power connection:

21.6...253 VAC
or

19.2...300 VDC

33

32

31

9

6

OK

4501

ÂÂÂ

3

ÂÂ

4

DRSL-DISPLAY display / programming front

Section 4.1 - Universal AC/DC transmitter

Functionality

The simple and easily understandable menu structure and the explanatory help texts guide you
effortlessly and automatically through the configuration steps, thus making the product very easy to
use. Functions and configuration options are described in the section ”Configuration / operating the
function keys”.

Application

• Communications interface for modification of operational parameters in DRST-AC.

• Can be moved from one DRST-AC device to another and download the configuration of the first unit
to subsequent units.

• When mounted in the process, the display shows process values and device status.

Technical characteristics

• LCD display with 4 lines:

Line 1 (H=5.57 mm) shows the scaled process value - OK or error.

Line 2 (H=3.33 mm) shows the selected engineering unit.

Line 3 (H=3.33 mm) shows analog output or TAG no.

Line 4 shows status for communication and signal trending.

• Programming access can be blocked by assigning a password. The password is saved in the device in
order to ensure a high degree of protection against unauthorized modifications to the configuration.

Mounting/demounting the DRSL-DISPLAY/DRST-CM

1: Insert the tabs of the DRSL-DISPLAY/DRST-CM into the holes at the top of the device.

2: Hinge the DRSL-DISPLAY/DRST-CM down until it snaps into place.

Demounting of the DRSL-DISPLAY/DRST-CM

3: Push the release button on the bottom of the DRSL-DISPLAY/DRST-CM and hinge the the
DRSL-DISPLAY/DRST-CM out and up.

4: With the DRSL-DISPLAY/DRST-CM hinged up, remove from holes at the top of the device.

1

4

ÂÂ

2

3

10

Section 7 - Order

DRST-AC = Universal AC/DC transmitter

Accessories

DRSL-DISPLAY = Display/programming front

DRST-CM = Communication enabler

Electrical specifications

Environmental conditions:

Operating temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to 60°C

Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to 85°C

Calibration temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20...28°C

Relative humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 95% RH (non-cond.)

Protection degree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IP20

Installation in pollution degree 2 & measurement / overvoltage category II.

Order

7

Mechanical specifications:

Dimensions (H x W x D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 x 23.5 x 104 mm

Dimensions (H x W x D) w/DRSL-DISPLAY/DRST-CM . . . . . . . . . . 109 x 23.5 x 116 / 131 mm

Weight approx. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 g

Weight incl. DRSL-DISPLAY/DRST-CM (approx.) . . . . . . . . . . . . . . 285 g / 350 g

DIN rail type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DIN EN 60715 - 35 mm

Wire size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.13...2.08 mm2 /

AWG 26...14 stranded wire

Screw terminal torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 Nm

Common electrical specifications:

Supply voltage, universal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.6...253 VAC, 50...60 Hz

or 19.2...300 Vdc

Max. required power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 1.8 W nom.

Max. power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 2.5 W

Isolation voltage - test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 kVac

Isolation voltage - working . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 Vac (reinforced) / 500 Vac (basic)

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Communication enabler DRST-CM/

Programming front DRSL-DISPLAY

Signal dynamics, input / output . . . . . . . . . . . . . . . . . . . . . . . . 20 bit / 18 bit

Signal/noise ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 60 dB

Response time (0...90%, 100...10%) . . . . . . . . . . . . . . . . . . . . . . . < 0.75 s

Output referred common mode rejection ratio . . . . . . . . . . . . . . . . 0.02 ppm / VHz

11

7

Order

Accuracy, the greater of general and basic values:

General values

Input type Absolute accuracy Temperature coecient

All ≤ ±0.3% of span* ≤ ±0.01% of span* / °C

Basic values

Input type Basic accuracy Temperature coecient

Current 1.5 mA 50 µA/ °C

Voltage 1.5 mVAC 50 µVAC /°C

EMC - immunity inuence . . . . . . . . . . . . . . . . . . . . . < ±0.5% of span*

Extended EMC immunity:

NAMUR NE 21, A criterion, burst . . . . . . . . . . . . . . . . . < ±1% of span*

of span = of selected standard range

* For custom signals, general accuracy and EMC specications are 0.3% of full scale

Input specifications:

Current input:

Signal range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0...5 AAC / 40...400 Hz

Maximum input limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.00 AAC @ 40°C

Programmable measurement ranges . . . . . . . . . . . . . . . . . . . . . . 0...0.5, 0…1, 0…2.5 & 0...5 AAC

Custom congurable signal range . . . . . . . . . . . . . . . . . . . . . . . 0….5 AAC / 40...400 Hz

Min. span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 AAC

Input resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nom. < 0.07 Ω

Voltage input:

Signal range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0...300 VAC / 40...400 Hz

Programmable measurement ranges . . . . . . . . . . . . . . . . . . . . . . 0...0.5, 0...1, 0...2.83, 0…5, 0…120, 0…230 &

0…300 VAC

Custom congurable signal range . . . . . . . . . . . . . . . . . . . . . . . 0...300 VAC / 40...400 Hz

Min. span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 VAC

Input resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nom. 3 MΩ || 100 pF

Configurable input limits:

Configurable input limits, low:

VOLT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 VAC to ‘Minimum selected input’

CURR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 AAC to ‘Minimum selected input’

Configurable input limits, high:

VOLT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ‘Maximum selected input’ to 300 VAC

CURR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ‘Maximum selected input’ to 5 AAC

12

Order

Input limit low/high, error indication levels:

UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See table on page 15

DOWN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See table on page 15

ZERO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See table on page 15

NONE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See table on page 15

Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5% of ‘Max. output’

Error detection release delay . . . . . . . . . . . . . . . . . . . . . . . . . . < 2.5 s

Current output specifications:

Active unipolar and bipolar mA:

Programmable ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0...20, 4...20, S4...20, ±10 and ±20 mA

Direct or Inverted action

V-curve function, 100-0-100% . . . . . . . . . . . . . . . . . . . . . . . . . . 20-0-20 mA

Load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 800 Ω

Passive 2-wire mA:

Programmable ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0...20 and 4...20 mA

Direct or Inverted action

V-curve function, 100-0-100% . . . . . . . . . . . . . . . . . . . . . . . . . . 20-0-20 mA

External 2-wire loop supply . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5...30 V

7

Common specifications current output:

All standard and custom ranges can be selected as Direct or Inverted action.

V-function can be selected for xed output ranges starting at zero.

Signal range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0...23 mA (unipolar) /

-23...+23 mA (bipolar)

Current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 28 mA (unipolar) /

±28 mA (bipolar)

Load stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.001% of span / 100 Ω

Response time, programmable . . . . . . . . . . . . . . . . . . . . . . . . . 0.0...60.0 s

Output limitation at outside range . . . . . . . . . . . . . . . . . . . . . . . See table on page 14

Voltage output specifications:
All standard and custom ranges can be selected as Direct or Inverted action.

V-function can be selected for xed output ranges starting at zero.

Programmable ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0/0.2...1, 0/1...5, 0/2...10, ±1, ±5 and ±10 V

Direct or Inverted action

V-curve function, 100-0-100% . . . . . . . . . . . . . . . . . . . . . . . . . . 1-0-1 V, 5-0-5 V and 10-0-10 V

Load, min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 500 kΩ

Response time, programmable . . . . . . . . . . . . . . . . . . . . . . . . . 0.0...60.0 s

Output limitation at outside range . . . . . . . . . . . . . . . . . . . . . . . See table on page 14

Observed authority requirements:

EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2014/30/EU

LVD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2014/35/EU

RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2011/65/EU

Approvals:

c UL us, Standard for Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . UL 508 / C22.2 No. 14

13

8

Output error indication = NONE

Extended working range

Configurable input error indication and input limits

Section 8 - Configurable input error indication and input limits

Configurable input error detection

To increase system safety and integrity, users can program a high and low input error detection level. Input signals outside
the selected error indication levels will cause the output of the device to go to the programmed error state. The error is
indicated in display line 1 as IN.ER and at the same time the backlight flashes.

The two configurable input error detection levels can be set and enabled individually, just as it is possible to individually set
the output error indication for each of the two detection levels. This allows users to differentiate process faults, broken input
wires, etc.

Available output error states for each of the two detection levels are: UP, DOWN, ZERO and NONE.

Output error indication uses the error states defined by NAMUR NE43 for 4...20 mA output span, and for all other output
spans equivalent output error indications are used (see table on page 14).

Example - 4..20 mA output span and both high and low configurable input error limit enabled with output error

indication set to ZERO:

Device

Min. input

Configurable input

limit, low

Normal measuring range

Extended measuring range

Configurable input

limit, high

Device

Max. input

Normal range

Extended working range

Error current

Output error current can be

individually set to:
ZERO: 0 mA
UP: 23 mA
DOWN: 3.5 mA
DISABLED: No error indication,
output limited to 3.8 mA

Example - input limits disabled:

‘Min. selected

input’ - 15%

4.0 mA

3.8 mA

Output error indication = ZERO

Normal measuring range

Extended measuring range

20.5 mA

20.0 mA

Error current

Output error current can be

ZERO: 0 mA
UP: 23 mA
DOWN: 3.5 mA
DISABLED: No error indication,
output limited to 20.5 mA

20.0 mA

individually set to:

‘Max. selected

input’ + 15%

Input:
ARMS,
VRMS
etc.

20.5 mA

Normal range

4.0 mA

3.8 mA

14

Input:
ARMS,
VRMS
etc.

Configurable input error indication and input limits

8

Input limit check
disabled

Output

span

4...20 mA 0 mA 23 mA 3.8 mA 20.5 mA 23 mA 3.5 mA 0 mA

0...20 mA 0 mA 23 mA 0 mA 20.5 mA 23 mA 0 mA 0 mA

±10 m A -11.5 m A 11.5 mA -10.25 mA 10.25 mA 11.5 m A -11.5 m A 0 mA

±20 mA -23 mA 23 mA -20.5 mA 20.5 mA 23 mA -23 mA 0 mA

Output

span

0...1 V 0 V 1.15 V 0 V 1.025 V 1.15 V 0 V 0 V

0.2...1 V 0 V 1.15 V 0.195 V 1.025 V 1.15 V 0.175 V 0 V

0...5 V 0 V 5.75 V 0 V 5.125 V 5.75 V 0 V 0 V

1...5 V 0 V 5.75 V 0.975 V 5.125 V 5.75 V 0.875 V 0 V

0...10 V 0 V 11.5 V 0 V 10.25 V 11.5 V 0 V 0 V

2...10 V 0 V 11.5 V 1.95 V 10.25 V 11.5 V 1.75 V 0 V

±1 V -1.15 V 1.15 V -1.025 V 1.025 V 1.15 V -1.15 V 0 V

±5 V -5.75 V 5.75 V -5.125 V 5.125 V 5.75 V -5.75 V 0 V

±10 V -11.5 V 11.5 V -10.25 V 10.25 V 11. 5 V -11.5 V 0 V

Output

limit low

Input limit check
disabled

Output

limit low

limit high

limit high

Output

Output

Input limit check Low and / or High enabled

Output

Output

limit low

Input limit check Low and / or High enabled

Output

limit low

Output

limit high

Output

limit high

error

indication,

UP

Output

error

indication,

UP

indication,

indication,

Output

error

DOWN

Output

error

DOWN

Output

error

indication,

ZERO

Output

error

indication,

ZERO

Output

error

indication,

NONE

No error
indication

No error
indication

No error
indication

No error
indication

Output

error

indication,

NONE

No error
indication

No error
indication

No error
indication

No error
indication

No error
indication

No error
indication

No error
indication

No error
indication

No error
indication

15

9

DRSL-DISPLAY/DRST-CM display readout

Section 9.1 DRSL-DISPLAY/DRST-CM display readout

Display readout of input error detection and signal ”outside range”

Configurable input error detection - readout (IN.ER):

Input Range Readout Limit

CURR All IN.ER See table on page 14

VOLT All IN.ER See table on page 14

Display readout below min. / above max. (-1999, 9999):

Input Range Readout Limit

All All

-1999 Display readout <-1999

9999 Display readout >9999

Readout at hardware error

Error search Readout Cause

Check measurement of analog output AO.ER No load on the current output (only S4...20 mA)*

Communications test between
DRSL-DISPLAY/DRST-CM and DRST-AC

Configuration error CO.ER Default configuration is loaded

Configuration error CO.ER Invalid configuration**

Check that saved configuration in
DRSL-DISPLAY/DRST-CM matches device

Hardware error RA.ER RAM error*

Hardware error AD.ER A/D converter error*

Hardware error AO.SU Analog output supply error*

Hardware error EF.ER External flash error*

Hardware error IF.ER Internal flash error*

All error indications in the display flash once per second. The help text explains the error. If the error is an

!

input loop error, the display backlight flashes as well - this is acknowledged (stopped) by pushing the 3
button.

Error is acknowledged by either stepping through the basic setup, or by resetting the device power.

*

Some types of errors can only be acknowledged by resetting the device power.

** Error is acknowledged by stepping through the basic setup.

NO.CO Connection error

TY.ER Invalid type or rev. no.

16

Section10.1 - Connections

Supply

31 32 33

Inputs:

Connections

10

41

11

Current

-

mA

Voltage

44

4342

41

44

4342

Outputs:

2-wire transmitterCurrent Voltage, 10 VVoltage, 1 V

V

(±)(±)

14

1312

+-

11

V

(±)

14

1312

+-

14

1312

+

11

mA

14

1312

+

-

11

17

11

Block Diagram

Section11.1 - Block Diagram

44

43

42

(N)



  

 

Voltage

input

Current

input

41

HW

Watchdog

Red

Green

CPUA/D

DRST-AC

4179

D / A

500

Supply

33

32

31

12

N.C.

Supply

I+

21.6...253 VAC or

19.2...300 VDC

A

14

10 V

13

50

1 V

V

I- / V-

11

I + V

A

V

I I

V

+

-

A

18

Configuration / Operating the function keys

12

Section 12.1 - Configuration / operating the function keys

Documentation for routing diagram.

In general

When configuring the DRST-AC, you will be guided through all parameters and you can choose the settings
which fit the application. For each menu there is a scrolling help text which is automatically shown in line 3 on
the d isplay.

Configuration is carried out by use of the 3 function keys:

1 will increase the numerical value or choose the next parameter

2 will decrease the numerical value or choose the previous parameter

3 will save the chosen value and proceed to the next menu

When configuration is completed, the display will return to the default state 1.0. Pressing and holding 3 will
return to the previous menu or return to the default state (1.0) without saving the changed values or parameters.

If no key is activated for 1 minute, the display will return to the default state (1.0) without saving the changed
values or parameters.

Further explanations

Password protection: Programming access can be blocked by assigning a password. The password is saved in
the device in order to ensure a high degree of protection against unauthorised modifications to the
configuration. Default password 2008 allows access to all configuration menus.

Signal and sensor error indication via display front DRSL-DISPLAY/DRST-CM

Error indication is displayed in line 1 as text and at the same time the backlight flashes. A flashing bullet in line
4 is indicating correct functioning of DRST-DISPLAY.

Signal and sensor error indication without display front

Status of the unit can also be read from the red/green LED in the front of the device.

Green flashing LED 13 Hz indicates normal operation.

Green flashing LED 1 Hz indicates loop error.

Steady green LED indicates internal error.

Steady red LED indicates fatal error.

Advanced functions

The unit gives access to a number of advanced functions which can be reached by answering “Yes” to the point
“ADV. SE T”.

Memory (MEM): In the memory menu you can save the configuration of the device in the DRST-DISPLAY, and
then move the DRST-DISPLAY onto another device of the same type and download the configuration in the
new device.

Display setup (DISP): Here you can adjust the brightness contrast and the backlight. Setup of TAG numbers with
6 alphanumerics. Selection of functional readout in line 3 of the display - choose between readout of analogue

19

12

Configuration / Operating the function keys

Section 12.1 - Configuration / Operating the function keys

output or tag no.

Two-point process calibration (CAL): The device can be process-calibrated in 2 points to fit a given input signal . A low input
signal (not necessarily 0%) is applied and the actual value is entered via DRSL-DISPLAY/DRST-CM Then a high signal (not
necessarily 100%) is applied and the actual value is entered via DRSL-DISPLAY/DRST-CM. If you accept to use the calibration,
the device will work according to this new adjustment. If you later reject this menu point or choose another type of input signal
the device will return to factory calibration.

Process simulation function (SIM): In the menu point “EN.SIM” it is possible to simulate an input signal by means of the arrow
keys and thus control the output signal up or down. You must exit the menu by pressing 3 (no time-out).

The simulation function exits automatically, if the DRSL-DISPLAY/DRST-CM is detached.

Password (PASS): Here you can choose a password between 0000 and 9999 in order to protect the unit against unauthorised
modifications to the configuration. The unit is delivered default without password.

Language (LANG): In the menu ”LANG” you can choose between 7 different language versions of help texts that will appear in
the menu. You can choose between UK, DE, FR, IT, ES, SE and DK.

Output function (OFUN): Here the output characteristics can be set to either Direct (DIR) or Inverted (INV) function. Output
type and range are set in the normal programming menu. If the selected output range is starting at zero, V-curved output
function (VFUN) can also be selected. The output characteristics will then be 100-0-100% on the basis of a linear 0-100% input
signal.

Auto diagnostics

The device performs an advanced auto diagnosis of the internal circuits - check tables on page 15.

20

Section 13.1 - Routing diagram

If no key is activated for 1 minute, the display will return to the default state 1.0 without saving
configuration changes.

1 Increase value / choose next parameter

2 Decrease value / choose previous parameter

3 Save the chosen value and proceed to the next menu

Hold 3 Back to previous menu / return to menu 1.0 without saving.

Power up

40.0
%

10.4 mA

*0

and held:
Toggle line 3 function
A.Out / TAG.
(Setting is volatile ­use DISP setup menu
to change and store
line 3 function).

Routing Diagram

13

0-5

0-2.5

0-1

Correct

OK

NO

YES

NO

ADV.SET

Txt 2

Yes

No

CURR
VOLT

OK

VOLT

IN TYPE

Txt 3

0000
9999

OK

0000

PASSW.

Txt 1

*1

CURR

OK

0-0.5

CUST

0-5

I.RANGE

Txt 4

300

0.00

OK

*7 *9 *7 *8 *9

0.00

IN.LO
Txt 48

OK

300

0.00

230

IN.HI

Txt 49

OK

0-300
0-230
0-120

0-5

0-2.83

0-1

0-0.5

CUST

Default state.

*0

Line 1 shows the scaled process value - OK or
error.
Line 2 shows the selected engineering unit.
Line 3 shows analogue output or TAG no.
Line 4 shows status for communication and
signal trending.

Only displayed if password is enabled.

*1

NO

YES

YES

ADV.SET

Txt 2

VOLT

OK

0-230

V.RANGE

Txt 5

OK

Continued on the page
Routing diagram ADV.SET

Only displayed if CUST is selected!

*7

This menu will change range automatically.

Value will be forced to be greater than

*8

xx.LO.

Maximum and minimum value selectable

*9

from menu must be based on input type
VOLT: Min: 0.000 Max: 300
CURR: Min: 0.000 Max: 5.00

OK

21

13

Routing Diagram

blank

:
:

111.1

%

11.11

@F

1.111

@C

1111

9999

-9999

9999

-9999

CURR

VOLT

-/+20

-/+10
S4-20

4-20
0-20

PASS

ACTI

°C
°F

%

A
bar
cm

ft

ft/h

ft/min

ft/s

g

gal/h

gal/min

GW

hp

hPa

Hz

UNIT

A RMS

Txt 6

1.111

DEC.P

Txt 7

Selectable UNITS:

in

in/h

in/min

in/s

ips

K
kA
kg

kJ

kPa

kV

kW

kWh

l

l/h

l/min

l/s

m

m/h

m/min

m/s

m/s2

m3

m3/h

m3/min

mA

mbar

mils
min
mm

mm/s

mol

Mpa

mV

0.00

DISP.LO

Txt 8

DISP.HI

MW

MWh

N

Ohm

Pa

pH

rpm

s
S

t
t/h
uA
um

uS

V

W

Wh

5.000

Txt 9

OK

yd
VRMS
ARMS

[blank]

CURR

ANA.OUT

Txt 10

CURR

VOLT

4-20

Txt 11

0-10

Txt 12

1-5
0-5

0.2-1
0-1

OK

OUT.MOD

*2

OK

OK

O.RANGE

*3

-/+10

-/+5

-/+1
2-10
0-10

OK

O.RANGE

*3

ACTI

Txt 13

OK

22

Routing Diagram

13

YES

NO

NO

ILIM.L

Txt 50

OK

NO

*15

0.00

0.00

0.00

VRMS

Txt 51

UP

ZERO

DOWN

NONE

UP

OUT.ERR

Txt 54

UP

ZERO

YES

NO

OK

YES

ILIM.H

Txt 52

OK OK

NO

300
230

230

VRMS

Txt 53

*16

DOWN

NONE

UP

OUT.ERR

Txt 54

60.0

0.0

0.0

RESP.

Txt 15

OK

To default state

1.0

23

13

Routing Diagram

Section 13.2 - advanced settings (ADV.SET)

MEM, DISP,

CAL, SIM,

PASS, LANG,

OFUN

MEM

SETUP

Txt 15/1

DISP

SETUP

Txt 15/2

CAL

SETUP

Txt 15/3

VFUN (V-shaped output function) is only available when a

*6

Selectable range as defined by DEC.P, DISP.LO and DISP.HI.

SAVE

*5

LOAD

OK

SAVE

MEMORY

Txt 16

9
0

OK

3

CONTRA

Txt 17

YES
NO

OK

NO

CAL.LO

Txt 21

YES
NO

OK

9
0

OK

9

LIGHT

Txt 18

OK

5.000

0.000

OK

NO NO

0.000

A RMS

Txt 22

*5

OK

9

A

TAGNO_

Txt 19

YES

NO

NO

CAL.HI

Txt 23

5.000

0.000

TAG

A.OUT

OK OK

A.OUT

LINE 3

Txt 20

5.000

0.000

OK OK

5.000

A RMS

Txt 24

*5

fixed output range starting at zero is seleceted.
DIR (direct) and INV (inverted) output can be combined with
all fixed or CUST output ranges.

YES
NO

NO

USE.CAL

Txt 25

OK

To default state

1.0

SIM

SETUP

Txt 15/4

PASS

SETUP

Txt 15/5

LANG

SETUP

Txt 15/6

OFUN

SETUP

Txt 15/7

OK

NO

ENA.SIM

Txt 26

NO

YES
NO

OK

NO

EN.PASS

Txt 28

NO

DE, DK, ES, FR,

IT, SE, UK

OK

UK

LANGUA.

Txt 30

VFUN

INV

DIR

OK OK

DIR

O.FUNC

Txt 31

OK

2.500

A RMS

Txt 27

*5

OK

In the submenu simulation (SIM) you must press 3 or remove
the DRSL-DISPLAY/DRST-CM to return to the default state 1.0.

9999

0

OK

OK

0

NEW.PAS

Txt 29

OK

24

Section 13.3 - Help text overview

Routing Diagram

13

Set correct password

[1]

Enter advanced setup menu?

[2]

Select current input

[3]

Select voltage input

Select 0...5 A input range

[4]

Select 0...2.5 A input range

Select 0...1 A input range

Select 0...0.5 A input range

Select custom current input range

Select 0...230 V input range

[5]

Select 0...120 V input range

Select 0...2.83 V input range

Select 0...1 V input range

Select 0...0.5 V input range

Select custom voltage input range

Select display unit

[6]

Select decimal point position

[7]

Set display range low

[8]

Set display range high

[9]

Select current as analog output type

[10]

Select voltage as analog output type

Select 0...20 mA output range

[11]

Select 4...20 mA output range

Select 4...20 mA with safety readback

Select -10...10 mA output range

Select -20...20 mA output range

Select 0.0...1 V output range

[12]

Select 0.2...1 V output range

Select 0...5V output range

Select 1...5V output range

Select 0...10V output range

Select 2...10V output range

Select -1...1 V output range

Select -5...5 V output range

Select -10..10 V output range

Select active output mode

[13]

Select passive output mode

Set Analog output response time in seconds

[14]

Select Analog Output Function

[15]

Enter Language setup

Enter Password setup

Enter Simulation mode

Perform Process calibration

Enter Display setup

Perform Memory operations

Load saved configuration into module

[16]

Save configuration in display front

Adjust LCD contrast

[17]

Adjust LCD backlight

[18]

Write a 6-character device TAG

[19]

Analog output value is shown in display line 3

[20]

Device TAG is shown in display line 3

Calibrate Input low to process value?

[21]

Set value for low calibration point

[22]

Calibrate Input high to process value?

[23]

Set value for high calibration point

[24]

Use process calibration values?

[25]

Enable simulation mode?

[26]

25

13

Help text overview

[27]

[28]

[29]

[30]

[31]

[32]

[33]

[34]

[35]

[36]

[37]

[38]

[39]

[40]

[41]

[42]

[44]

[45]

[46]

[47]

[48]

[49]

[50]

[51]

[52]

[53]

[54]

Set the input simulation value

Enable password protection?

Set new password

Select language

Select direct output mode

Select inverted output mode

Select V-function output mode

Display underrange

Display overrange

Input underrange

Input overrange

Analog output supply error

Analog output error - check output connections and reset power

Configuration error - default configuration is loaded

RAM memory error

Invalid configuration

A/D converter error

No communication

Input range limit error - Input outside configurable input range limit

Invalid configuration type or version

External flash error

Internal flash error

Set input range low

Set input range high

Enable configurable input limit, low

Set configurable input limit, low

Enable configurable input limit, high

Set configurable input limit, high

Select downscale at error

Select zero output at error

Select upscale at error

Select no error action - output undefined at error

Section 13.4 - Document history

The following list provides notes concerning revisions of this document.

Rev. ID Date Notes

100 1740 Initial release of the product

26

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace
period to the normal one (1) year product warranty to cover handling and shipping time. This ensures
that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for
any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any
correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

FOR WARRANTY RETURNS, please have the
following information available BEFORE contacting
OMEGA:

1. Purchase Order number under which the product
was PURCHASED,

2. Model and serial number of the product under
warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our
customers the latest in technology and engineering.

OMEGA is a trademark of OMEGA ENGINEERING, INC.
© Copyright 2018 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

Where Do I Find Everything I Need for

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