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Appendix C: Modbus® specifications
APPENDIX C: MODBUS® SPECIFICATIONS
Inputs TYPE VALID RANGE BASE OFFSET
Input Calibration (fixed-point integer) sint16 ±300.00 4x10496 169
Normal Logging Frequency (max 31 days) uint32 0 - 2678400 s. 4x10500
Alarm Logging Frequency (max 31 days) uint32 0 - 2678400 s. 4x10502
Alarm low limits float ±80000.00 4x10583
Alarm high limits float ±80000.00 4x10585
Low table limit (4-20mA) float ±80000.00 4x10587
High table limit (4-20mA) float ±80000.00 4x10589
Summary Page Gauge Low Limit float ±80000.00 4x10591
Summary Page Gauge High Limit float ±80000.00 4x10593
Name string 0 - 32 characters 4x10595
Recognition Time uint16 0 - 28800 s. 4x10627
Alarm reset time (seconds) (max 8 hours) uint16 0 - 28800 s. 4x10629
Input Type uint8 0x00 - 0xFF 4x10631
Custom Units of Measure string 0 - 16 characters 4x10632
Type of Units uint8 0x00 - 0xFF 4x10648
Arbitrary ordering number for this I/O point uint8 0x00 - 0xFF 4x10649
Minimum value float ±80000.00 3x01536 42
Minimum value (fixed-point integer) sint32 ±80000.00 3x01538
Maximum value float ±80000.00 3x01540
Maximum value (fixed-point integer) sint32 ±80000.00 3x01542
Last alarm (timestamp) uint32 Any Value 3x01546
Real value (floating-point) float ±80000.00 3x01550
Real value + units (string) string Any Non-Null 3x01552
Real value (fixed-point integer) sint32 ±80000.00 3x01576
Enables/Disables the entire I/O point. bit TRUE or FALSE 0x01536 32
Enables/Disables Alarming bit TRUE or FALSE 0x01537
Enables/Disables Alarm on return-to-normal bit TRUE or FALSE 0x01540
Reset the Minimum bit TRUE 0x01552
Reset the Maximum bit TRUE 0x01553
Alarm Condition uint8 0x00 - 0xFF 1x00256 42
Realtime state, ignoring recognition time. uint8 0x00 - 0xFF 1x00270
USER PROFILES TYPE VALID RANGE BASE OFFSET
Access level uint8 4x00768 86
Call escalation priority level uint8 0x00 - 0xFE 4x00769
The user’s full name string 0 - 32 characters 4x00772
Username for login string 0 - 16 characters 4x00796
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