Instructions on Communication, Error message, General

(1)P (proportional action)

Control output rate (%) is set for measuring range. Control output value changes in proportion with measured value (PV) and set value (SV).

For wide proportional band, change of control output is small relative to deviation. The narrower the proportional band is, the larger the output variation is and the more intense proportional action is. Too narrow proportional band causes ON-OFF like action with oscillation.

(2)I (integral time)

A function that compensates the offset created by proportional action. Effect of compensation is weaker for longer integral time and is intensified by shortening time. Too short integral time causes integrating hunting and may result in wavy operation.

(3)D (derivative time)

Improves stability of control by reducing overshooting of integration from expected change of the control output. Effect of compensation is weaker for shorter derivative time and is intensified for longer time. Too long derivative time may result in oscillating operation.

6-3. Control output characteristics ( digit of function selecting screen of mode 2 screen group)

Control output characteristics determines the control output direction according to the measured value (PV) relative to the set value (SV).

(1) (RA characteristics)

Control output increases for lower measured value relative to set value, it is used for heating on temperature control.

(2) (DA characteristics)

Control output decreases for lower measured value relative to set value, it is used for cooling on temperature control.

6-4. Error message

(1) Defect of measuring input

In case of thermocouple break, R.T.D. A break and PV being approx. 10% greater than higher limit of measuring range.

In case of PV being approx. 10% less than the lower limit of measuring range with inverted polarity of input wiring.

Cold junction (CJ) defect to higher side for thermocouple input.

Cold junction (CJ) defect to lower side for thermocouple input.

Break of B or B and multiple break of A, B, B upon R.T.D. input

(2) Defect of Heater Break Alarm CT Input

The CT input value exceeds 55A (550A for 0~5V DC input).

The CT input value falls to -5A (-50A for 0~5V

DC input) or lower.

Note: Message of heater break alarm is only displayed on heater break alarm set screen.

is shown when output is OFF. It is not defective.

Note: Contact to us or our representative in case of any defect regarding this product.

7. Instructions on Communication

7-1. General

Section 7 deals with communication interface, which is an optional function, and communication procedure.

For the CN150 series, two types of communication

interface, RS-422A and RS-485 are available. Each enables a personal computer or the like to set and read various data by the use of signals which conform with EIA standards.

RS-422A and RS-485 are communication standards established by the Electric Industries Association (EIA), which are meant for electrical or mechanical matters, the so-called hardware, but not for the software portion of the data transmission procedure.

Accordingly, communication even with an apparatus having the same interface cannot be made unconditionally. It requires a thorough understanding of specifications and procedures.

The use of RS-422A or RS-485 allows a plurality of apparatuses to be connected in a parallel configuration. It is also possible to use a line converter for conversion of RS-232C to/from RS-422A and RS-232C to/from RS-485.

7-2. How to connect CN150 Series with host computer

7-2-1. Control signals

Since the apparatus is provided with input/output transmitting and receiving data lines and an earthing line for signals but not with any other signal line, control signals should be processed by the host side.

The method of processing differs from system to system and connection details should meet requirements of the host computer. Examples of connection are shown in the following.

7-2-2. Connection of RS-422A

(1)The logical levels of input and output of this apparatus are basically as follows:

Mark state **– <**+ (Example: SD- < SD+) (including the state in which communication is not carried

out)
Space state	– >+ (Example: SD- > SD+)

However, since the impedance of SD+ and SD- of this apparatus is high until just before transmission, the above levels are output just before commencing transmission.

(2) Example of Connection of RS-422A

Host computer		SR73A and 74A Controllers 1
FG (Earthing for protection)		SR73A and 74A Controllers 1
FG (Earthing for protection)		terminal No.
Shielding wire		terminal No.
SD +	SD+ 2		Transmitted data
SD -	SD - 3
RD+	RD+ 4		Received data
RD -	RD - 5		Received data
SG	SG	1	Earthing for signal
		SR73A and 74A Controllers 2
		terminal No.
	SD+ 2		Transmitted data
	SD -	3
	RD+ 4		Received data
	RD -	5	Received data
Terminal resistance (510Ω)	SG	1	Earthing for signal

Note: Some line converters between RS-232C and RS-422A

may have the following indication for terminal (connector) output. If that is the case, logical levels should be checked before connection.

- 10 -

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Omega CN154, CN155 Instructions on Communication, Error message, General, Connection of RS-422A

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