Communications Data Setting Examples

CompoBus/D Communications Card Operations							Chapter 5

Instance		Attribute	Name	Content	Setting	Default	Read	Write	Size
					range

01		1A	Power scale	Power data unit selection can be set and	–15 to 15	00	Yes	Yes	Byte
				read. The power data unit value is	(F1 to 0F
				calculated as follows:	hex)
				Unit = 0.1 [W] x 1/2c
				c: Power scale set value
				Set a negative value as its 2’s
				complement.

		1B	Voltage scale	Voltage data unit selection can be set and	–15 to 15	00	Yes	Yes	Byte
				read. The voltage data unit value is	(F1 to 0F
				calculated as follows:	hex)
				Unit = 0.1 [V] x 1/2d
				d: Voltage scale set value
				Set a negative value as its 2’s
				complement.

		1C	Time scale	Time data unit selection can be set and	–15 to 15	00	Yes	Yes	Byte
				read. The time data unit value is calculated	(F1 to 0F
				as follows:	hex)
				Unit = 0.1 [V] x 1/2e
				e: Voltage scale set value
				Set a negative value as its 2’s
				complement.

		1D	Reference From	00: Operate at B1–01 setting.	---	00	Yes	No	Byte
			Net	01: Set B1–01 to “3” and operate with
				CompoBus/D.

Note	1. The Net Reference and Reference From Net functions are applicable for Inverter software
		versions S1042 and later. Cannot be changed during running. Check the version with the In-
		verter monitor function U1–14. If the software version is S1040, set b1–01 to “3.”
Note	2. Under the DeviceNet protocol, the unit for the speed reference is always r/min. The number of
		motor poles (2 to 32) must be set in parameter o1–03 (frequency reference setting and dis-
		play units) when using DeviceNet (open network).
Note	3. Cannot be changed during running.

DCommunications Data Setting Examples

Example 1: Finding the communications data for outputting a frequency of 60 Hz with the following conditions set.

Number of poles (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 1/20) = 1,800

•Converting communications data to hexadecimal: 1,800 (dec) = 708 (hex)

Example 2: Finding the communications data for outputting a frequency of 60 Hz with the following condition set.

Frequency setting (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 (dec) = 1,770 (hex)

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