6BFUNCTIONS IMPLEMENTED IN THE SMART P500
0BMODBUS RTU PROTOCOL
5.6.3. FUNCTION CODE 08 – DIAGNOSTICS
Function 08 offers several mechanisms that can be used to verify the operation of the
communication system between the master and the smART P500. This function uses a
two bytes sub-function code in the request to completely define the required function.
The sub-function codes implemented in the relay are shown in the following table:
Sub
function
Description
00
Return Query Data
10
Clear counters and diagnostic register
11
Return bus message count
12
Return bus communications error count
13
Return bus exception error count
14
Return slave message count
15
Return slave no response count
5.6.4. FUNCTION CODE 16 – WRITING OF VALUES
Using this function a set of values can be written in the memory of the smART P500 in a
single operation. The values to write are always 16 bits (2 bytes) in length and the most
significant byte is transmitted first. Up to 125 contiguous points can be written in a single
operation.
Only a small group of the available points can be written. See the memory map before
trying to write to a register. Some of the values that can be written have 32 or more bits.
In these cases, it requires all the points to be written in a single operation using this
function code. The smART P500 will reject partial writes to these points, except where
otherwise indicated.
5.6.5. EXCEPTION CODES
When an error is detected (different than a CRC error), the smART P500 generates a
response containing an exception code to inform the master. Generated responses are
the following:
Summary of Contents for smART P500
Page 1: ...Instruction Manual Multifunction Protection Relay smART P500...
Page 23: ...2BTABLES INDEX THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY...
Page 39: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 9 Wye Wye Connection measured neutral...
Page 40: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 10 Wye Wye Connection sensitive neutral...
Page 41: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 11 Open Delta Connection measured neutral...
Page 42: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 12 Open Delta Connection sensitive neutral...
Page 511: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 6 Moderately ANSI curve...
Page 513: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 7 Very inverse ANSI curve...
Page 515: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 8 Extremely inverse ANSI curve...
Page 532: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 14 Recloser Curves 101 119...
Page 535: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 15 Recloser Curves 120 142...
Page 538: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 16 Recloser Curves 151 202...
