User Tools
modbus:modbus-en
Differences
This shows you the differences between two versions of the page.
| — |
modbus:modbus-en [2018/11/12 08:56] (current) |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ====== Modbus TCP/IP ====== | ||
| + | [[:english#command_stations|{{ :interface.png}}]][[:english|{{ :rocrail-logo-35.png}}]] | ||
| + | [[:english|Content]] -> [[:english#command_stations|Command Stations]] -> **[[:english#protocols|Protocols]]** | ||
| + | * **[[:modbus:modbus-en|Modbus TCP/IP]]** | ||
| + | {{http://www.modbus.org/images/logo_new.jpg}}\\ | ||
| + | \\ | ||
| + | =====Introduction===== | ||
| + | The Siemens LOGO! devices do support Modbus over TCP/IP. Those devices are helpful in case 230VAC must be switched in context of the model railroad.\\ | ||
| + | {{:modbus:modbus-tcpip-struct.png?0x120}}{{:modbus:logo-example.png?0x120}}{{:modbus:logo-siemens.png}}{{:modbus:modbus-logo-addressing.png?0x160}}\\ | ||
| + | The Modbus protocol is very straight forward and therefor easy to implement.\\ | ||
| + | Serial Modbus devices can be connected by a gateway.\\ | ||
| + | |||
| + | //[[https://en.wikipedia.org/wiki/Modbus|Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices.]]// | ||
| + | \\ | ||
| + | |||
| + | =====Setup General===== | ||
| + | {{:modbus:modbus-gen-en.png}}\\ | ||
| + | \\ | ||
| + | ====IP==== | ||
| + | The IP prefix. If not set, the IP of the Rocrail server will be used.\\ | ||
| + | ====Port==== | ||
| + | The default Modbus [[http://www.iana.org/assignments/port-numbers|registered port number 502]] will be used in case of zero.\\ | ||
| + | |||
| + | ====Poll options==== | ||
| + | |||
| + | ===Inputs=== | ||
| + | Poll discrete inputs.\\ | ||
| + | ===Holdings=== | ||
| + | Poll holding registers.\\ | ||
| + | ===Registers=== | ||
| + | Poll analog registers.\\ | ||
| + | ===Coils=== | ||
| + | Poll coil output state.\\ | ||
| + | ===Sleep=== | ||
| + | Pause in ms between the polling requests.\\ | ||
| + | |||
| + | |||
| + | \\ | ||
| + | =====Setup Devices===== | ||
| + | {{:modbus:modbus-dev-en.png}}\\ | ||
| + | A device must be added if polling is required to specify which type and rage.\\ | ||
| + | ====Sub IP==== | ||
| + | The last part of the device its IP address.\\ | ||
| + | ====Input/Coil range==== | ||
| + | Both ranges are automatically adjusted to multiples of 8.\\ | ||
| + | ====Ranges==== | ||
| + | If a range is set from zero to zero the polling for that type is disabled.\\ | ||
| + | |||
| + | |||
| + | |||
| + | \\ | ||
| + | |||
| + | =====Addressing===== | ||
| + | The addressing is based on the IP address of the Rocrail server.\\ | ||
| + | If the server hast IP address **192.168.0.120**, the base IP prefix is **192.168.0**.\\ | ||
| + | The Rocrail object bus will be used as IP suffix, for example if an output bus is **44**, the IP address will be **192.168.0.44**.\\ | ||
| + | |||
| + | \\ | ||
| + | |||
| + | =====Coils===== | ||
| + | A coil is a read/write output in the Modbus context, and is mapped to a Rocrail output/switch object.\\ | ||
| + | The output bus is the IP suffix, and the address is the coil address.\\ | ||
| + | |||
| + | \\ | ||
| + | |||
| + | =====Polling===== | ||
| + | Modbus inputs must be polled because of its master/slave architecture. (Originally RS485. Also new projects are based on RS485 like BiDiB where the GBMBoost master will do the polling.)\\ | ||
| + | If a Rocrail sensor is defined for this Interface ID, the eight bit module range, 8, will be requested for this IP suffix at a fixed interval.\\ | ||
| + | To activate polling the digint attribute fbpoll must be set to true. The psleep attribute is used for the polling interval in ms.\\ | ||
| + | |||
| + | ====Discrete Inputs==== | ||
| + | Input registers are reported as [[:sensor-int-en#type|sensor default type]].\\ | ||
| + | |||
| + | ====Coils==== | ||
| + | Coiuls are reported as output field events.\\ | ||
| + | |||
| + | ====Input Registers==== | ||
| + | Input registers are reported as [[:sensor-int-en#type|sensor register type]].\\ | ||
| + | |||
| + | ====Holding Registers==== | ||
| + | Holding registers are reported as [[:sensor-int-en#type|sensor register type]].\\ | ||
| + | \\ | ||
| + | |||
| + | =====Service===== | ||
| + | If the port is set > 1024, a Modbus service will be started; Rocrail will accept Modbus request on this port.\\ | ||
| + | Supported requests: | ||
| + | - **Write Single Coil**, this will be evaluated as an output field event. | ||
| + | For all other requests an exception response will be send back.\\ | ||
| + | |||
| + | \\ | ||
| + | =====PLC Address Types===== | ||
| + | ^ Mnemonic ^ Type ^ Size ^ Modbus ^ Rocrail ^ | ||
| + | | I | Digital Input | bit | Discrete Input | Sensor | | ||
| + | | Q | Digital Output | bit | Coil | Output/Switch | | ||
| + | | M | Memory | bit | Coil | Read Sensor, Write Output | | ||
| + | | AI | Analog Input | word | Register | Sensor register type | | ||
| + | | AQ | Analog Output | word | Register | Output analog port type | | ||
| + | | AM | Memory | word | Holding Register | Sensor register type | | ||
| + | |||
| + | |||
| + | \\ | ||
| + | |||
| + | =====Public Functions===== | ||
| + | {{:modbus:modbus-functions-en.png}}\\ | ||
| + | |||
| + | \\ | ||
| + | =====Links===== | ||
| + | {{ :modbus:modbus-sim.png?0x200}} | ||
| + | * http://www.modbus.org/ | ||
| + | * http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf | ||
| + | * http://www.modbus.org/docs/Modbus_Messaging_Implementation_Guide_V1_0b.pdf | ||
| + | * http://www.plcsimulator.org/ | ||
modbus/modbus-en.txt ยท Last modified: 2018/11/12 08:56 (external edit)
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
