Omega CN159, CN154, CN155 Communication error, Non-response process, Restrictions by commands, etc

Page 15

(2)One-Byte Data

One-byte data in the text has a fixed length of one character which is either 0 or 1. Seven items are covered, namely, stop status, manual status, AT status, AH status, AL/HB status and communication mode.

Stop (STBY), Manual (MAN), AT (ON), AH (ON), AL/HB (ON), SB (ON), Communication (when the remote mode is on).

1

Execution (EXEC), Auto (AUTO), AT (OFF), AH (OFF), AL/HB (OFF), SB (OFF), Communication (when the local mode is on).

0

(3)Special Data

Special data is data sent in response to numerical data which are outside of the ordinary range. Their patterns are shown in the following.

Numerical data is +10000~+10999.

10000

U

0

0

0

0

0

10999

U

0

0

9

9

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Numerical data exceeds the indicated range.

more than

D

E

H

0

0

0

less than

D

E

L

0

0

0

11000

-3000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Numerical data is over the scale.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The (+) side

H

0

0

0

0

0

The (-) side

L

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CT temperature exceeded the higher limit value or fell below the lower limit value in the case of thermocouple input.

The higher

C

J

H

0

0

0

The lower

C

J

L

0

0

0

limit side

limit side

Wire breaking detected in the case of R.T.D. input

B 0 0 0 0 0

CT input value exceeded the higher limit value or fell below the lower limit value.

The higher

H

B

H

0

0

0

The lower

H

B

L

0

0

0

limit side

limit side

 

 

 

 

 

 

 

 

 

 

 

 

Control output either turned on or turned off while CT input measurement was ongoing.

– – – – – –

Data is undeterminable due to a set value of alarm code, P=OFF, or some other reasons.

Data in the case where the alarm code is 0 and D2 (AH, AL) or D3 (CT, HB) command has been received.

Data in the case where the alarm code is 1~4 and D3 (CT, HB) command has been received.

AL data in the case where the alarm code is 5~8 and D2 (AH, AL) command has been received.

I, D, SF or MR data in the case where P=OFF and D5 (P, I, D, SF, MR) command has been received.

+0 0 0 0 0

7-5-3. Communication error

When an error is found in the block after receiving data from the host, an error message is sent back. The format of error messages and the types of errors are described in the following.

Error Message Format

@

Address No.

E

R

Space

Error No.

:

BCC

CR

 

 

 

40H

Higher Lower

45H

52H

20H

 

3AH

Higher Lower

0DH

 

position position

 

 

 

 

 

position position

 

 

 

 

 

 

 

 

 

 

Error Types

Error No.

Error Type

Description

 

 

 

05

BCC error

Arithmetic value is not in accord with BCC.

 

 

 

06

Command error

Command other than prescribed one was received.

 

 

 

08

Data format error

The format is different from prescribed one.

 

 

 

09

Data error

Value is out of prescribed data range in the case of

write command.

 

 

11

Write mode error

Write command was received when write command

was invalid.

 

 

12

Option error

Command of unequipped option was received.

 

 

 

7-5-4. Non-response process

When an error is found in the block upon receiving data transmitted from the host, the next correct data block is waited for without transmission of response data. Therefore, the host has to retransmit the command block in any of the following cases:

The start character was not @ (40H). The communication No. did not match. The end character was not CR (0DH).

A hardware error such as a framing error, overrun or a parity error occurred.

7-5-5. Restrictions by commands, etc.

(1)Restrictions by Read Command

Upon receiving the D1 read command, the status of unequipped options (AH, AL/HB, SB) become 0 (30H).

(2)Restrictions by Write Command

ER09

In the case of P=OFF and Y and P output, write data of E2 (write command of manual output value) is either of the following two. Otherwise, ER09 is sent back.

0%

+

0

0

0

0

0

100%

+

0

0

1

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In the case of P=OFF and V and I output, a lower limit output limiter value or a higher limit output limiter value is to be set.

ER11

If a write command is invalid due to the local mode, a set value of keylock, AT or some other conditions, and that command is received, ER11 should be sent back. The following cases also require ER11 to be sent back.

Condition

 

Received Write Command

 

 

 

 

E2

(Manual control output value)

Stop mode (STBY)

E4

(Manual status)

 

E5

(AT status)

Auto mode (AUTO)

E2

(Manual control output value)

Manual mode (MAN)

E5

(AT status)

 

E6

(Set value of AH)

Alarm code = 0

E7

(Set value of AL)

 

E8

(Set value of HB)

Alarm code = 1~4

E8

(Set value of HB)

Alarm code = 5~8

E7

(Set value of AL)

P=OFF

EE (DF: Hysteresis)

 

E5

(AT status)

 

EB (I: Integral time)

P=OFF

EC (D: Derivative time)

 

ED (SF: Target value function)

 

EF (MR: Manual reset)

I=OFF

EF (MR: Manual reset)

I=OFF

ED (SF: Target value function)

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Image 15
Contents Page Page Page Page Mounting Dimension of current transformer CT for heater break alarmHow to remove the instrument out of the case Wiring External dimensions and panel cutoutInstruction for front panel Screen change Power on and initial screen displayAlarm type code table Screen instructionBasic screen Instruction for screen change and each screenMeasuring range code table Soft start time setting screen screen No.14Supplementary explanation of screens Setting of set value SVAT Auto tuning OperationAuto return function Setting of alarmPID Screen No.2, 4 and 5 of mode 1 screen group SupplementConnection of RS-422A Error messageInstructions on Communication GeneralDelay setting screen Setting of communication parametersCommunication mode selecting screen Communication address setting screenData format Text Text formatCommunication error Restrictions by commands, etcNon-response process Read command Write commandList of transmitted/received data Specifications Others Alarm Output OptimalHeater Break Alarm option Set value Bias option

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