User's Manual

PL-611 IQ Radar 300 Page 97
Appendix III
Appendix III Appendix III
Appendix III
Appendix III
Single Parameter Access (SPA)
This appendix provides advanced communication information to qualified personnel,
enabling access to any parameter value in any available format.
Built into the IQ Radar 300 is an advanced handshaking area used to read and write
single registers to the unit. This section performs function similar to the Parameter
Descriptions section on page 55, with two qualifiers:
1. Advanced section is more powerful and harder to program.
2. Advanced section only gives you access to one parameter at a time.
Mapping
Parameter Read and Write (40,090 – 40,097) is a series of eight registers used for
reading and writing parameter values to and from the IQ 300. The first three registers
are always unsigned integers representing parameters and index values. The second
five registers are the format and value(s) of the parameter.
All parameters normally accessed through the hand-held programmer are available
through these registers.
Address Description
40,090 Parameter (integer)
40,091 Primary Index (integer)
40,092 Secondary Index (integer)
40,093 Format word (bit mapped)
40,094 Read value, word 1
40,095 Read value, word 2
40,096 Write value, word 1
40,097 Write value, word 2
Reading Parameters
Complete the following to read parameters through Modbus:
1. Send the parameter, its primary index, and its secondary index (usually 0), and
format to registers 40,090 to 40,093.
2. Wait until you can read the written values from the registers (40,090 to 40,093) to
confirm that the operation is complete.
3. Read the value from registers 40,094 and 40,095.