西门子S7-200 Modbus RTU master指令与VLT2800通讯调试说明
S7-200 MODBUS-RTU VLT .
MODBUS MODBUS CTROL MODBUS MGS CRC
Micro/WIN V4.0 SP5 Modbus RTU
1. Micro/WIN V4.0 SP5
1. Modbus RTU Port 0 Port 1
2. Modbus RTU
3. Modbus RTU CPU CPU 2.00 2.01 6ES721* ***23-0BA* 1.22 1.22 S7-200 CPU
Modbus RTU Modbus RTU I/O Modbus RTU
1.
2. Modubs RTU
.Modbus RTU
1. Modbus RTU
SM0.0 MBUS_CTRL
2. SM0.0 Modbus RTU
:
a. EN SM0.0
b. Mode 1 Modbus 0 PPI
c. Baud 1200 2400 4800 9600 19200 38400 57600 115200
d. Parity
1
2
e. Timeout 1000 1 1 - 32767
f. Done 1 MBUS_MSG
g. Error Done 1
1
2
3
2. Modbus RTU MBUS_MSG Modbus
3. Modbus RTU
:
a. EN MBUS_MSG MBUS_MSG MBUS_MSG Done
b. First
c. Slave 1 - 247
d. RW 0 1
1.
2.
e. Addr 00001 0xxxx -
10001 1xxxx -
30001 3xxxx -
40001 4xxxx -
f. Count
Modbus / 120
MBUS_MSG
g. DataPtr 1.
2.
h. Done
i. Error Done 1
1
2
3
4 slave address, Modbus address, count,
RW
5 Modbus/
6 Modbus
7
8 CRC
-
101
102
103
104
105
106
107
108
MBUS_MSG 6
delay 3
3
3. CPU V Library Memory Modbus Master 284 V
Modbus 5 Modbus Master Modbus Modbus Modbus Master
00001 - 09999
10001 - 19999
30001 - 39999
40001 - 49999
4.Modbus
S7-200 Modbus Master Slave Modbus
7-200 0xxxx 1xxxx Modbus
Main------------------
Mbus_ctrl------------
Mbus_msg-----------
Mbussm1-------------crc
mbus_ctrl timeout 1000ms. Mbus_msg M2.1,M2.2,M0.1
VB284 VB384
s7200-vlt2800 modbus rtu PLC MODBUS RTU
MODBUS RTU CRC CPU