Four-Channel Digital-to-Analog
Convertor for the Siemens
Digital Level Sensor
Providing for interface-to-analog SCADA systems
The digital-to-analog convertor is a solidstate, stand-alone interface board that
polls the Siemens digital level sensor
(DLS) and outputs a 4-20mA analog signal
for use by SCADA systems having only
analog inputs available. The interface
board can poll up to four digital level
sensors and output up to four analog signals. The analog signal can output level or
temperature data from a particular sensor.
Electrical specifications
Operating temperature range: -40 °C
to +85 °C
Power requirements: 12 to 15 VDC
Power consumption
Standby: 38mA
Published by and copyright © 2010:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Energy, Inc.
Oil & Gas Division
10730 Telge Road
Houston, TX 77095 USA
1 (888) 856-4528
www.siemens.com/energy/
oilandgas
Order No. E50001-D440-A146-X-76US
Printed in USA
BU 1430F IN 0910.25
All rights reserved.
Subject to change without prior notice.
Trademarks mentioned in this document are the property of Siemens AG,
its affiliates, or their respective owners.
The information in this document
contains general descriptions of the
technical options available, which may
not apply in all cases. The required
technical options should therefore be
specified in the contract.
During poll: 145mA* (polling time =
two-second max)
Analog outputs: 20mA max per channel
if unit sources loop power
*Power consumption does not include connected
level sensors.
RS232 port
Provided for configuration and
diagnostics
9600 or 1200 baud rate
4-20mA conversion accuracy*
Resolution: 16 bit
Monotonicity: 16 bit minimum
Integral non-linearity: +/- 0.01% of FS
max
Offset (4mA) at 25 °C: +/- 0.01% of FS
max
Offset drift: +/- 0.25 ppm/°C
Total output error: +/- 0.2% of FS max
Total output drift: +/- 50 ppm/°C
VCC supply sensitivity: 50 mA/mV
*Except as limited by sensor and protocol
resolution
Communicates using HyperTerminal
or similar terminal emulation software
using ASCII commands
RS485 port
Two- or four-wire communications
Cycles power between polls
Answers for energy.
For more information about this and other
digital level sensor products and applications, contact us at 1 (888) 856-4528 or
oilandgaslcm.energy@siemens.com.