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(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).
Execution (EXEC), Auto (AUTO), AT (OFF), AH
(OFF), AL/HB (OFF), SB (OFF), Communication
(when the local mode is on).
(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.
Numerical data exceeds the indicated range.
Numerical data is over the scale.
CT temperature exceeded the higher limit value or fell
below the lower limit value in the case of thermocouple
input.
Wire breaking detected in the case of R.T.D. input
CT input value exceeded the higher limit value or fell
below the lower limit value.
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.
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
Error Types
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
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.
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.
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.
1
0
10000
U
0
0
0
0
0
10999
U
0
0
9
9
9
more than
11000
D
E
H
0
0
0
less than
-3000
D
E
L
0
0
0
The (+) side
H
0
0
0
0
0
The (-) side
L
0
0
0
0
0
C
J
H
0
0
0
C
J
L
0
0
0
The higher
limit side
The lower
limit side
+
0
0
0
0
0
–
–
–
–
–
–
The higher
limit side
The lower
limit side
H
B
H
0
0
0
H
B
L
0
0
0
B
0
0
0
0
0
@
40H
Address No.
:
3AH
BCC
CR
0DH
Higher
position
Lower
position
Higher
position
Lower
position
E
45H
R
52H
Space
20H
Error No.
Error No.
Error Type
Description
05
06
08
09
11
12
BCC error
Command error
Data format error
Data error
Write mode error
Option error
Arithmetic value is not in accord with BCC.
Command other than prescribed one was received.
The format is different from prescribed one.
Command of unequipped option was received.
Write command was received when write command
was invalid.
Value is out of prescribed data range in the case of
write command.
ER09
0%
+
0
0
0
0
0
100%
+
0
0
1
0
0
ER11
Condition
Received Write Command
Stop mode (STBY)
Auto mode (AUTO)
Manual mode (MAN)
E2 (Manual control output value)
E4 (Manual status)
E5 (AT status)
E2 (Manual control output value)
E5 (AT status)
E6 (Set value of AH)
E7 (Set value of AL)
E8 (Set value of HB)
E8 (Set value of HB)
E7 (Set value of AL)
EE (DF: Hysteresis)
E5 (AT status)
EB (I: Integral time)
EC (D: Derivative time)
ED (SF: Target value function)
EF (MR: Manual reset)
EF (MR: Manual reset)
ED (SF: Target value function)
Alarm code = 0
Alarm code = 1~4
Alarm code = 5~8
P=OFF
I=OFF
I=OFF
P=OFF
