Siemens S7-1200/1500 (Ethernet:ISO over TCP/IP) AddressingQR Code |
Topic: CM635 |
| Memory Type | Range | Description | Read/Write | Data Type | Memory Type |
|---|---|---|---|---|---|
| I | I | 0.00 - 65535.7 | Input Memory | R/W | Bit |
| IB | 0 - 65536 | Byte | |||
| IW | 0 - 65535 | Word | |||
| ID | 0 - 65535 | Double Word | |||
| Q | Q | 0.00 - 65535.7 | Output Memory | R/W | Bit Bit |
| QB | 0 - 65536 | Byte Byte |
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| QW | 0 - 65535 | Word Word |
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| QD | 0 - 65535 | Double Word Double Word |
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| M | M | 0.00 - 65535.7 | Internal Memory | R/W | Bit Bit |
| MB | 0 - 65536 | Byte Byte |
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| MW | 0 - 65535 | Word Word |
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| MD | 0 - 65535 | Double Word Double Word |
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| DB | DBX | 1.0 - 65535.65535 | Data BlockMemory | R/W | Bit Bit |
| DBB | Byte Byte |
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| DBW | Word Word |
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| DBD | Double Word Double Word |
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Note: Timers and Counters are System Blocks that are not addressable. |
Use the Offset column of the Data Block as the byte address for C-more. Even though the DB is defined as “Int” the offset is still byte not word.
| Siemens Elementary Types | C-more Tag Data Type | Siemens Memory Types |
|---|---|---|
| BOOL | Discrete | I/Q/M/DBX |
| BYTE | Signed Int 16 | IB/QB/MB/DBB |
| WORD | IW/QW/MW/DBW | |
| INT | ||
| DWORD | Signed Int 32 | ID/QD/MD/DBD |
| DINT | ||
| REAL | Floating PT 32 | ID/QD/MD/DBD |
| CHAR | Ascii String | DBB String/DBB Char |
| SIMATIC Variables Addressing Siemens Vs. C-more | ||||
|---|---|---|---|---|
| SIMATIC Variables Addressing Siemens Vs. C-more | SIMATIC Variables Addressing Siemens Vs. C-more | SIMATIC Variables Addressing Siemens Vs. C-more | SIMATIC Variables Addressing Siemens Vs. C-more | SIMATIC Variables Addressing Siemens Vs. C-more |
| SIMATIC Variable | Siemens Addressing | C-more Addressing | SIMATIC Variable | Siemens Addressing |
| MOTOR_RPM | DB2.DBW 0 | DB.DBW | 2.0 | — |
| SETPOINT_RPM | DB2.DBW 2 | DB.DBW | 2.2 | — |
| START | DB2.DBX 4.0 | DB.DBX | 2.4 | 0 |
| STOP | DB2.DBX 4.1 | DB.DBX | 2.4 | 1 |
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Note: There is a space on all the Siemens Addressing (DB2.DBW 0). |
View the PLC Variables Status
To view the status of the variables in the PLC, once you are Online with the PLC, from the Devices Tree of the TIA Portal (SIMATICSTEP7), add or open an existing Watch Table.
Data Block Addressing
Data Block Addressing syntax differs some between what is seen in the TIA Portal (SIMATICSTEP7) and in C-more. To view the Data Block, double click on the specific Data Block you wish to view. When a specific Data Block is selected, a window like the one shown below will open.
Using the Variable #3 as a sample, the Tag Name window from C-more would look as follows:
From the figure shown above:
- The image above shows DB2.
- Inside DB2, there are Four Variables:
- MOTOR_RPM is addressed at byte0 and is a 16 bit Integer.
- SETPOINT_RPM is addressed at byte2 and is also a 16bit Integer.
- START is addressed at byte 4, bit 0 and is a Boolean.
- STOP is addressed at byte 4, bit 1 and is a BOOLEAN.
If the "Offset" column is not displayed, right-click any column header to Show / Hide Columns.
If you view these Variables in the Watch Table of the TIAPortal (SIMATICSTEP7), they look more like the C-more syntax. From the Devices tree add new watch table or open an existing watch table.
The Watch and Force Tables window shown below will open. From this window you can Monitor the Variables shown.
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