









140DDI36400
代码错误
CPU模块
184 840使用100 00 2002年9月
注意:代码列中的信息仅在Flash下载实用程序中可见。
CPU模块
840使用100 00 2002年9月185
前面板
转换
滑动开关用于选择Modbus的通信参数设置
(RS232)端口。有三种选择:
1.将开关设置到顶部位置将为端口分配ASCII功能。
2.将开关设置到中间位置将分配远程终端单元(RTU)
端口的功能。
3.将开关设置为底部位置可以将通信参数分配给
软件中的端口。
该图显示了前面板滑动开关上可用的三个选项。
下表显示了ASCII通信端口参数。
下表显示了RTU通信端口参数。通信参数
已设置且不能更改。
注:当前面板开关处于以下状态时,CPU硬件默认为桥接模式
设置为RTU或ASCII模式。连接控制器时,面板设备连接
到CPU,Modbus端口可以与控制器通信
连接,以及登录Modbus Plus网络上的任何节点。
ASCII通信端口参数
波特率2400
奇偶
数据位7
停止位1
设备地址后面板旋转开关设置
RTU通信端口参数
波特率9600
奇偶
数据位8
停止位1
设备地址后面板旋转开关设置
RTU
记忆
ASCII码
CPU模块
186 840使用100 00 2002年9月
下表显示了有效的通信端口参数。
有效的通信端口参数
波特率19200 1200
9,600 600
7,200 300
4,800 150
3,600 134.5
2,400 110
2,000 75
1,800 50
奇偶校验启用/禁用
奇数/偶数
数据位7/8
停止位1/2
设备地址1…247
CPU模块
840使用100 00 2002年9月187
后面板
开关
下图显示了SW1和SW2设置。
SW1设置地址的高位(十位)。SW2设置
地址。下表显示了SW1和SW2地址设置。
SW1和SW2地址设置
节点地址SW1和SW2
1 ... 9 0 1 ... 9
10 ... 19 1 0 ... 9
20 ... 29 2 0 ... 9
30 ... 39 3 0 ... 9
40 ... 49 4 0 ... 9
50 ... 59 5 0 ... 9
60 ... 64 6 0 ... 4
注:如果选择“0”或大于64的地址,Modbus+LED将
“on”稳定,表示选择了无效地址。M)
CPU模块
188 840使用100 00 2002年9月
钥匙开关:当控制器处于工作状态时,钥匙开关保护存储器不受编程变化的影响
运行中。下图
140DDI36400

140DDI36400
Code Error
CPU Modules
184 840 USE 100 00 September 2002
Note: Information in the Code column is visible only with the Flash download utility.
CPU Modules
840 USE 100 00 September 2002 185
Front Panel
Switch
The slide switch is used to select the comm parameter settings for the Modbus
(RS232) ports. Three options are available:
1. Setting the switch to the top position assigns ASCII functionality to the port.
2. Setting the switch to the middle position assigns remote terminal unit (RTU)
functionality to the port.
3. Setting the switch to the bottom position lets you assign comm parameters to the
port in software.
The figure shows the three options that are available on the front panel slide switch.
The following table shows the ASCII comm port parameters.
The following table shows the RTU comm port parameters. The comm parameters
are set and cannot be changed.
Note: The CPU hardware defaults to bridge mode when the front panel switch is
set to RTU or ASCII mode. When networking controllers, a panel device connected
to the CPU Modbus port can communicate with the controller to which it is
connected, as well as log into any nodes on the Modbus Plus network.
ASCII Comm Port Parameters
Baud 2,400
Parity Even
Data Bits 7
Stop Bits 1
Device Address Rear panel rotary switch setting
RTU Comm Port Parameters
Baud 9,600
Parity Even
Data Bits 8
Stop Bits 1
Device Address Rear panel rotary switch setting
RTU
mem
ASCII
CPU Modules
186 840 USE 100 00 September 2002
The following table shows the valid comm port parameters.
Valid Comm Port Parameters
Baud 19,200 1,200
9,600 600
7,200 300
4,800 150
3,600 134.5
2,400 110
2,000 75
1,800 50
Parity Enable/Disable
Odd/Even
Data Bits 7 / 8
Stop Bits 1 / 2
Device Address 1 ... 247
CPU Modules
840 USE 100 00 September 2002 187
Rear Panel
Switches
The following figure shows the SW1 and SW2 settings.
SW1 sets the upper digit (tens) of the address. SW2 sets the lower digit (ones) of
the address. The following table shows the SW1 and SW2 address settings.
SW1 and SW2 Address Settings
Node Address SW1 SW2
1 ... 9 0 1 ... 9
10 ... 19 1 0 ... 9
20 ... 29 2 0 ... 9
30 ... 39 3 0 ... 9
40 ... 49 4 0 ... 9
50 ... 59 5 0 ... 9
60 ... 64 6 0 ... 4
Note: If "0" or an address greater than 64 is selected, the Modbus + LED will be
"on" steady, to indicate the selection of an invalid address.M)
CPU Modules
188 840 USE 100 00 September 2002
Key Switch The key switch protects memory from programming changes while the controller is
in operation. The following figure
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