Omron 3G3MV-PDRT2 User Manual page 279

Appendices
Note 4. If a frequency reference value has been already set and the frequency display unit is
changed via the network, a frequency reference value higher than expected may result after
unit conversion. After changing the frequency display unit, always check the frequency ref-
erence value before starting an operation.
● Communications Data Setting Examples
Example 1: Finding the communications data for outputting a frequency of 60 Hz with the following
conditions set.
Number of poles set in n035/o1-03: 4
Speed scale (attribute 16): 0
• Converting frequency to rotational speed:
Frequency x 120 / number of poles = 60 x 120/4 = 1,800 r/min
• Converting rotational speed to minimum unit:
Rotational speed / unit = 1,800 / (1 r/min x 1/2
• Converting communications data to hexadecimal: 1,800 (decimal) = 0708 (hex)
Example 2: Finding the communications data for outputting a frequency of 60 Hz with the following
condition set.
Frequency setting in n035/o1-03: 0 (Cannot be set with DeviceNet protocol.)
• Converting frequency to minimum setting unit:
Frequency / minimum unit = 60 / 0.01 = 6,000
• Converting communications data to hexadecimal: 6,000 (decimal) = 1770 (hex)
Example 3: Finding the communications data for setting a one-minute acceleration time with the fol-
lowing condition set.
Time scale (attribute 1C): − 3 (FD hex)
• Matching the acceleration time unit: 1 minute = 60 seconds = 60,000 ms
• Converting acceleration time to minimum unit:
Acceleration time / unit = 60,000 / (1 ms x 1/2
• Converting communications data to hexadecimal: 7,500 (decimal) = 1D4C (hex)
Communications Data Reference Example
●
In this example, the hexadecimal value 0BB8 that has been read is converted to frequency with the
following conditions set.
Number of poles set in n035/o1-03: 4
Speed scale (attribute 16): 1
• Converting communications data to decimal: 0BB8 (hex) = 3,000 (decimal)
• Converting from minimum unit to r/min:
Communications data x unit = 3,000 x (1 r/min x 1/2
0
) = 1,800
− 3
) = 7,500
1
) = 1,500 (r/min)
Chapter 10
10-21