Megmeet MC200-4AM - Usage Directions; Power Specifications; Performance Specifications; Buffer Memory (BFM)

2
2 Use Directions
2.1 Power Specification
Table 2-1 Power specification
Item
Description
Analog circuit
24Vdc (-15%~20%), maximum allowable ripple voltage 5%,
90mA (from basic module or external power supply)
Digital circuit
5Vdc 50mA (from basic module)
2.2 Performance Specification
Table 2-2 Performance specification
Item
Specifications
I/O points occupied
None
Conversion
speed
AD conversion
speed
15ms/channel (normal speed)
8ms/channel (fastest)
DA conversion
speed
6ms/channel (max.)
Analog input
range
Voltage input
-10~10Vdc (input resistance 200kΩ), input
signal frequency<10Hz.
Warning: This module can be damaged if the
input voltage exceeds ±15Vdc
Analog input
range
Current input
-20~20mA (input resistance 250Ω), input signal
frequency<10Hz.
Warning: This module can be damaged if the
input current exceeds ±32mA
Analog output
range
Voltage output
-10~10Vdc (external load resistance not less
than 2kΩ)
Current output
0~20mA (external load resistance is 500Ω or
less)
Digital output
Default: -2000~2000
setting range: -10000~10000
Digital input
Default: -2000~2000, setting range:
-10000~10000
Resolution
Voltage input
5mV
Current input
10µA
Voltage output
5mV
Current output
10µA
Overall
accuracy
Analog input
-10V~10V, -5V~5V, -20~20mA: ±1%
-100mV~100Mv: ±5%
Analog output
±1% of full range
Isolation
Use optical-electric coupler for isolation
between analog circuit and digital circuit. Use
DC/DC converter for isolation between the
basic module’s power supply and external
power supply. No isolation between analog
channels
2.3 Buffer Memory (BFM)
MC200-4AM exchanges data with the basic module through BFM. The basic
module uses TO command to write data into the BFM of MC200-4AM to
configure the status of MC200-4AM. It also uses TO command to write in DA
conversion input data. It uses FROM command to read AD conversion result
and other data from the BFM of MC200-4AM.
Table 2-3 describes the contents of the BFM of MC200-4AM.
Table 2-3 BFM Contents
BFM
Contents
Remark
*#0
I/O mode selection
Default: H0000
*#1
Average sampling times of input
channel 1
Default: 8
*#2
Average sampling times of input
channel 2
Default: 8
#3
Average value of input channel 1
#4
Average value of input channel 2
#5
Current value of input channel 1
#6
Current value of input channel 2
*#7
AD conversion speed
Default: 0 (15ms/CH), high
speed (8ms/CH) if set to 1
*#8
Output data of output channel 1
Default: 0
*#9
Output data of output channel 2
Default: 0
*#10
Output channel reset command
Default: H0000
BFM
Contents
Remark
*#11
Channel characteristics setting
confirmation command
Default: H0000
*#12
Input channel 1-X0
Default: 0 (input mode 0)
*#13
Input channel 1-Y0
Default: 0 (input mode 0)
*#14
Input channel 1-X1
Default: 2000 (input mode 0)
*#15
Input channel 1-Y1
Default: 10000 (input mode 0)
*#16
Input channel 2-X0
Default: 0 (input mode 0)
*#17
Input channel 2-Y0
Default: 0 (input mode 0)
*#18
Input channel 2-X1
Default: 2000 (input mode 0)
*#19
Input channel 2-Y1
Default: 10000 (input mode 0)
*#20
Output channel 1-X0
Default: 0 (output mode 0)
*#21
Output channel 1-Y0
Default: 0 (output mode 0)
*#22
Output channel 1-X1
Default: 2000 (input mode 0)
*#23
Output channel 1-Y1
Default: 10000 (input mode 0)
*#24
Output channel 2-X0
Default: 0 (output mode 0)
*#25
Output channel 2-Y0
Default: 0 (output mode 0)
*#26
Output channel 2-X1
Default: 2000 (input mode 0)
*#27
Output channel 2-Y1
Default: 10000 (input mode 0)
#28 ~ #33
Reserved
#34
Error status
*#35
Initialization
Default: 0
*#36
Setting change enable
1 (yes), 0 (no); default: 1
#4094
Module software release
H1000
#4095
Module ID
H3222
Explanation:
1. The basic module can use TO command to write data in BFMs marked “*”
only, but it can use FROM command to read data from any BFM. When
reading from reserved BFMs, the obtained value is 0.
2. BFM#0: channel mode selection. It adopts 4 hexadecimal digits H×
4
×
3
×
2
×
1.
Table 2-4 shows its bit status information.
Table 2-4 BFM#0 information
Bit
Value
Information
×
1
0
Input range: -10V~10V
Analog
input
channel 1
1
Input range: -5V~5V, -20~20mA
2
Input range: -100mV~100mV
3
Channel closed
×
2
0
Input range: -10V~10V
Analog
input
channel 2
1
Input range: -5V~5V, -20~20mA
2
Input range: -100mV~100mV
3
Channel closed
×
3
0
Output mode: -10V~+10V
Analog
output
channel 1
1
Output mode: 0~20mA
2
Output mode: 4~20mA
×
4
0
Output mode: -10V~+10V
Analog
output
channel 2
1
Output mode: 0~20mA
2
Output mode: 4~20mA
For example: Writing H0123 into BFM#0 makes the following settings:
Input channel 1: closed;
Input channel 2 mode: -100mV~100mV；
Output channel 1 mode: 0~20mA (note that the wiring for voltage output is
different from that for current input, see section 1.3);
Output channel 2 mode: -10V~10V；
3. BFM#1~BFM#2: average sampling times setting; setting range: 1~4096.
Default: 8, corresponding to normal speed; choose 1 if high speed is needed.
4. BFM#7: AD conversion speed setting. 0: 15ms/channel (normal speed); 1:
8ms/channel (high speed). Setting BFM#7 will restore BFM#1-#2 to the
default values, which should be noted in programming. If necessary, you can
re-set BFM#1-#2 after changing the conversion speed.
5. BFM#10: output channel reset command. When the PLC is in STOP mode,
the latest output values in RUN mode will be maintained. To reset these
values to make them become deviation values, write hexadecimal value
H×
4
×
3
×
2
×
1
into BFM#10, where ×
1
is the command for channel 1, ×
2
the
command for channel 2, ×
4
and ×
3
are meaningless. ×=1 means resetting to
deviation values.
6. BFM#11: channel characteristics setting confirmation command. After
setting the channel characteristics (from BFM#12 to BFM#27), you need to