2
Project
Indicators
Precision
Thermocouple ±
0.3%
input
range.Ambient
temperature compensation error
≤
2
℃
Thermal
resistant
± 0.5% input range
Isolation
The sampling channel is isolated from
the power supply, the sampling channel
is isolated from the output, and the
channels are isolated from each other
Note
①
: when the input type of channel 2 and channel 4 is 0, the
temperature control output OUT2 and OUT4 will be automatically
assigned to the refrigeration control output of channel 1 and channel 3;
If the input type of channel 1 to channel 4 is not selected as 0, and are
set to the heating and cooling control function, then the refrigeration
control of each channel can choose OUT5 ~ OUT12 to output, or
through the PLC read MTC #733 (refrigeration output state) register to
use the PLC I/O port output refrigeration control.
3. 3 Buffer Zone
（
BFM
）
MTC-04 Modbus or MCbus through the BFM and the main module
temperature data and other information exchange. Reading and writing
attributes of buffer can use MODBUS or MCBUS instructions for
reading and writing. If you read the reserve unit, will get zero value.
Save mark Y representative with the parameter save function, can be
flash memory, marked N said cannot be flash memory. Using MODBUS
agreement, most once writeable only 50 BFM unit. BFM unit part
content as follows:
1. The channel operation monitoring;
2. Channel characteristics set;
3. Control function setting;
4. BFM parameters save Settings
；
5. Other.
For more about the PID, set, alarm, MCbus and other related content
and routines, please refer to the MTC-04-NTR thermostat user manual
".
3. 3.1 The channel operation monitoring
MTC-04-NTR buffer (BFM) to monitor the operation of the channel
contents in Table 3-3.
Table 3-3 The channel operation monitoring of MTC-04-NTR buffe
（
BFM
）
BFM
Contents
Remarks
na
tur
e
Sa
ve
CH1 CH2 CH3 CH4
#701 #702 #703 #704 Measured value
（
PV
）
*1
Units: 0.1
℃
and 0.1
℉
R
N
#709 #710 #711 #712
Heat side
control output
(MV) * 2
The default
value: 0.0%
(percentage
show
）
R
N
#717 #718 #719 #720
More
paragraphs of
the currently
executing
period control *
3
Default value:
0.0%
(expressed as a
percentage)
R
N
#725 #726 #727 #728
Multi-step
control current
execution
segment * 3
Default value
：
0
Range:0~8
R
N
#733
Output state of
refrigeration
end *4
Default value
：
0
R
N
#734
Input port
status*5
Default value
：
0
R
N
#735
Error status
word * 6
Default value
：
0
R
N
#736
Set value range
error address*7
0:normal
Other values:
setting the
wrong BFM
address
R
N
#737
Cold junction
temperature*8
Default value
：
0 R
N
#738 #739 #740 #741
Work status
word * 9
Default value
：
0
R
N
* 1. #701 ~ #704:The measured value of channel 1 to channel 4. The
unit is determined according to the input type (#901 ~ #904). When the
mode is Celsius, the unit is 0.1
℃
; when the mode is Fahrenheit, the
unit is 0.1
℉
.
* 2. #709 ~ #712:Heating side control output value MV; #717 ~ #720:
cooling hot side control output value MV; The control output value of the
channel obtained by the control algorithm.
* 3. #725 ~ #728: Each channel multi-step setting executes the current
segment. The segment number being executed when multiple segment
Settings are displayed. 0: indicates that the execution state is not set in
multiple segments or that multiple segments are completed.
* 4. #733: Output status of refrigeration end. Bit0 corresponds to the
output state of the refrigeration end of channel 1, Bit1 corresponds to
the output state of the refrigeration end of channel 2, and so on. When
is 1, the output of the refrigeration end is effective; when is 0, the output
of the refrigeration end is invalid.
* 5. #734: Input port status. Bit0 corresponds to input port 1, Bit1 to
input port 2, and so on. A value of 1 indicates that the input is valid, and
a value of 0 indicates that the input is invalid.
* 6. The failure status information of #735 is shown in table 3-4.
Table3-4 BFM#735 State Information
A state of BFM#735 ON
（
1
）
OFF
（
0
）
b0
：
Error
When b1 ~ b15 any error occurs,
this flag is 1 (b1 ~ b2 in any
one of 1, stop all channel AD
converter)
Correct
b1
：
Save
－
－
b2
：
Hardware fault
AD converter or other hardware
failure
Hardware
normal
b3
：
Set value
backup error
When the interference and
the MTC due to an internal error
occurs, the flag will change
to 1. Then if you turn the
power off, still not be clear error,
please contact the sales agent or
our
Data
backup
normal
b4
：
The cold
junction
temperature
compensation error
b5
：
AD transform
digital range error
AD transform digital output value
is less than -1 or greater than
4096, the flag is 1
Digital
output
value is
normal
b6
：
Set data
recovery error
When the interference and
the MTC due to an internal error,
if error reading backup data, the
flag is 1
－
b7
：
Save
－
－
b8
～
b15 Broken
accidentally
detection (only
support
thermocouple)
1 ~ 4 channel thermocouple
broken accidentally, the flag is 1
No broken
accidentall
y wrong
channel
* 7. #736: error address setting value range. Incorrect BFM area code
is displayed.
* 8. #737: reflects the current cold end temperature.
* 9. #738 ~ #741: status word for each channel. Shows the error state
and control state of each channel, #738 corresponds to channel 1,
#739 corresponds to channel 2, and so on. See table 3-5 for specific
information.
Table 3-5 each channel error status and control of the state
Bite
Definition
ON
（
1
）
OFF
（
0
）
b0
～
b3
Alarm 1 ~ 4 state Alarm
No alarn
b4
Sign of
Initialization
complete
Initialization complete
Initialization
unfinished
b5
Auto-tuning state Self-tuning state
Status of no
self-tuning
b6
Control state
Control state
uncontrolled
state
b7
Control
completion status
The temperature reaches
setting and in a stable
state
Incomplete
control
b8
～
b15 Save
－
－
