Siemens 505-2557 installation and operation guide Effect, Out-of-Range Input, Signals

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Effect of

RTD inputs exceeding 849.8 degrees C for 100 Ohm platinum or 260.0

Out-of-Range Input

degrees C for 120 Ohm nickel and 10 Ohm copper will cause the overrange

Signals

bit to be set. A maximum temperature of 849.9 degrees C for 100 Ohm

platinum or 260.1 degrees C for 120 Ohm nickel and 10 Ohm copper will be

returned for any positive overrange input.

Similarly an input below ±199.8 degrees C for 100 Ohm platinum or ±79.8

degrees C for 120 Ohm nickel or ±100 degrees C for 10 Ohm copper will

cause the underrange bit to be set.

NOTE: The SIMATIC 505±2557 uses the least significant bit (16) to indicate

an open RTD. The value of this bit is set to 1 when this condition occurs.

Figure 1-3 Effect of Voltage Input - 100 Ohm Platinum

Figure 1-4 Effect of Voltage Input - 120 Ohm Nickel

SIMATIC 505±2557 Installation and Operation Guide

Description

1-5

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Contents Simatic Copyright 1998 by Siemens Energy & Automation, Inc Manual Publication History List of Effective Pages Contents Iv Contents List of Figures List of Tables Preface Approval Agency ApprovalsEuropean Community CE100 Ohm, 10 Ohm, 120 Ohm RTDs, or Millivolt Inputs DescriptionOperating Modes Word Input to the PLC from the Module Scale Units RTD Input to Digital ConversionSignals EffectOut-of-Range Input Effect of Voltage Input 10 Ohm Copper Input Resolution ResolutionInstalling and Configuring the Module Calculating the I/O Base Power BudgetSelecting 2 and 3 Wire or 4 Wire Operation Installing and Configuring the Module Configuring Temperature or SelectingMillivolt Input Selecting Data Selecting DegreesCelsius or FahrenheitConfiguration Jumper Locations Inserting Module IntoBase Copper Wire Table at 25 Degrees Celsius Wiring the Input ConnectorsPress In Wiring Connector Wiring Diagram for 2, 3, or 4 Wire RTD Wiring Diagram for Millivolt Measurements Cable Grounding Example I/O Configuration Chart Advanced Function Programming Advanced Advanced Software FunctionsIntroduction OverviewSetting the Module ConfigurationJumper Logging Controller I/OMemory Input Channel Data Internal Register StructuresInput and Output Register Offsets Input RegistersPeak/Valley Hold Input Words Input Flag BitsAveraging Output Data RegistersFunction Enable Bits Control RegistersInputs Discrete Handshake Inputs Data Identification Bits OutputsData Loading Process Loading Data into the Simatic 505±2557 ModuleSample Low and High Alarm Setpoints Identifying the Data Being Transferred 11 Enabling the Functions Loaded Loading Programs into the I/O Module 13 Startup Relay Ladder Logic Page Timing Constraints When UsingTiming Overhead for Functions Enabled Timing ConsiderationsAdditional Information about Each Function Default ValuesDefault Function Values Default Function Values for Simatic 505±2557Degrees Fahrenheit Alarm SetpointsDegrees Centigrade orDigital Filtering Averaging Peak and ValleyHold Flag Bits Hold ResetPrecedence FunctionTroubleshooting Symptom Probable Cause Corrective Action 10 Troubleshooting Flow Diagram17 I/O Register Quick Reference I/O Register Quick ReferenceOr K Memory Configuration Tables Page Addressing Worksheet 18 Open RTD Status Bits Items Unique to the Simatic 505±2557 ModuleTroubleshooting Table B-1 Specifications SpecificationsSpecifications subject to change without notice Jumper Settings Log Sheet Customer Response Business Reply Mail