Siemens 505-2557 installation and operation guide Iv Contents

3.2	Internal Register Structures	3-5
	Description of the I/O Registers	3-5
	Input Registers	3-5
	Output Registers	3-7
	Control Registers	3-8
	Inputs	3-8
	Outputs	3-10
	Loading Data into the SIMATIC 505±2557 Module	3-11
3.3	Loading Programs into the I/O Module	3-15
3.4	Timing Considerations	3-18
	Timing Constraints When Using Advanced Functions	3-18
3.5	Additional Information about Each Function	3-19
	Default Values	3-19
	Degrees Centigrade or Degrees Fahrenheit	3-20
	Scaling	3-20
	Alarm Setpoints	3-20
	Digital Filtering	3-21
	Averaging	3-22
	Peak and Valley Hold	3-22
	Peak and Valley Hold Reset	3-23
	Flag Bits	3-23
	Advanced Function Precedence	3-24
3.6	Troubleshooting	3-25
	Troubleshooting the System	3-25
3.7	I/O Register Quick Reference	3-27
3.8	V or K Memory Configuration Tables	3-28
3.9	Addressing Worksheet	3-30
3.10	Items Unique to the SIMATIC 505±2557 Module	3-31

Appendix A Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Appendix B Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Appendix C Jumper Settings Log Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

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