Siemens Milltronics SF 500 - Page 87

7ML19985CN01 Milltronics SF 500 - INSTRUCTION MANUAL Page 81
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Communications
All parameters normally accessed through the hand-held programmer are available
through these registers.:
Reading Parameters
To read parameters through Modbus follow these steps:
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 above values from the registers (40,090 to 40,093).
3. Read the value from registers 40,094 and 40,095.
Writing Parameters
To set parameters through Modbus follow these steps:
1. Send the parameter, its primary index, and its secondary index (usually 0) to
registers 40,090, 40,091, and 40,092.
2. Write the value to registers 40,096 and 40,097
3. Write the desired format word to register 40.093 to enable the SF 500 to interpret the
value correctly.
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 Read value, word 1
40,097 Read value, word 2