S7
S7 is a polling based protocol over tcp. This is not ideal for high resolution logging, as it takes a certain time to complete a read request. These are the datatypes we support:
| Type | Example mapping | Converts to type (.net) |
|---|---|---|
| Word (Db 1, offset 1) | DB1,DBW1 | UInt16 |
| DWord | DB1,DBD1 | UInt32 |
| LWord | DB1,DBL1 | UInt64 |
| Bit (Offset 0 bit 0) | DB1,X0.0 | Bool |
| Int | DB1,I1 | Int16 |
| Dint | DB1, DI1 | Int32 |
| LINT | DB1,DBLI1 | Int64 |
| Real | DB1,REAL1 | Single |
| Lreal | DB1,LREAL1 | Double |
| BYTE | DB1,BYTE1 | Byte |
| SBYTE | DB1,SBYTE1 | SByte |
| String (Offset 1 length 10) | DB1,STRING1.10 | String |
| Inputs, for example bit (no comma needed!) | IX0.2 | |
| Output, for example bit (no comma needed!) | QX0.2 |
To set up an s7 connection, you need a CPU type, Rack and Slot number.
| CPU type | Default Rack | Default Slot |
|---|---|---|
| S7-300 | 0 | 2 |
| S7-400 | 0 | 2 or 3 |
| S7-1200 | 0 | 1 |
| S7-1500 | 0 | 1 |
PLC requirements
In order to be able to communicate with your target, "Permit access with PUT/GET communication from remote partner" should be checked: (S7-1200 & S7-1500 => due to the built-in firewall) 
In order to be able to log data from datablocks, optimized block access should be disabled: 
