schmersal Praxi 100, Manual

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6.5 Example Messages
6.5.1 Example 1 - Write Process Data
Command Master - Slave:
Answer Slave - Master:
Mesage Frame:
Write the process data 42001…42003 with command 16 (Preset Multiple Registers).
Table 36.
Table 37.
Table 38.
Address 01 hex Slave address 1 hex (= 1)
Function 10 hex Function 10 hex (= 16)
Data
Starting address HI 07 hex
Starting address 07D0 hex (= 2000)
Starting address LO DO hex
No. of registers HI 00 hex
Number of registers 0003 hex (= 3)
No. of registers LO 03 hex
Byte count 06 hex Byte count 06 hex (= 6)
Data HI 00 hex
Data 1 = 0001 hex (= 1). Setting control word run bit to 1
Data LO 01 hex
Data HI 00 hex
Data 2 = 0000 hex (= 0).
Data LO 00 hex
Data HI 13 hex
Data 3 = 1388 hex (= 5000),
Speed Reference to 50.00%
Data LO 88 hex
Error Check
CRC HI C8 hex
CRC field C8CB hex (= 51403)
CRC LO CB hex
Address 01 hex Slave address 1 hex (= 1)
Function 10 hex Function 10 hex (= 16)
Data
Starting address HI 07 hex
Starting address 07D0 hex (= 2000)
Starting address LO DO hex
No. of registers HI 00 hex
Number of registers 0003 hex (= 3)
No. of registers LO 03 hex
Error Check
CRC HI 80 hex
CRC 8085 hex (= 32901)
CRC LO 85 hex
01 10 07 D0 00 03 06 00 01 00 00 13 88 C8 CB
The reply to Preset Multiple Registers message is the echo of 6 first bytes.