Data types
When creating a tag you have to specify its properties. Data type are specific to JMobile Studio, memory type are specific to the selected protocol. Choose the value according to the internal representation you need for the selected controller address.
Note: arrays type use the same data type followed by "[ ]" (i.e.: boolean [ ])
On some PLCs (e.g. CODESYS) arrays start from index 1 while on JMobile Studio the arrays start from index 0. This means that arrayTAG[1] on PLC is the arrayTAG[0] on JMobile Studio.
| Data Type | Memory Space | Limits |
|---|---|---|
| boolean | 1-bit data | 0 ... 1 |
| byte | 8-bit data | -128 ... 127 |
| short | 16-bit data | -32768 ... 32767 |
| int | 32-bit data | -2.1e9 ... 2.1e9 |
| int64 | 64-bit data | -9.2e18 ... 9.2e18 |
| unsignedByte | 8-bit data | 0 ... 255 |
| unsignedShort | 16-bit data | 0 ... 65535 |
| unsignedInt | 32-bit data | 0 ... 4.2e9 |
| uint64 | 64-bit data | 0 ... 1.8e19 |
| float | IEEE single-precision 32-bit floating point type | 1.17e-38 ... 3.4e38 |
| double | IEEE double-precision 64-bit floating point type | 2.2e-308 ... 1.79e308 |
| string | Array of elements containing character code defined by selected encoding | |
System Time
Format of System Time inside the HMI Device is the Unix time (also known as Epoch time). It is the number of seconds that have elapsed since the Unix epoch, that is the time 00:00:00 UTC on 1 January 1970.
Example:
| Tag Value | System Time | ISO 8601 | |
| 0 | 01/01/1970 – 01:00:00 | 1970-01-01T00:00:00+00:00 | |
| 1 | 01/01/1970 – 01:00:01 | 1970-01-01T00:00:01+00:00 | |
| 60 | 01/01/1970 – 01:01:00 | 1970-01-01T00:01:00+00:00 |