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The driver automatically converts to/from BCD for you and exposes any counter tags as UInt16 values. CountersĬounters in the PLC are stored in BCD. A DataType is not specified when accessing Timers. When you write to a timer it is automatically converted from milliseconds into S5 time format for you. Timers are scaled up to a DWord and converted from S5 time format so they can represent the time in milliseconds without requiring any multipliers. Strings are assumed to be in the S7 string format and have a max length of 210. When addressing a Bit at a given offset, that offset is always treated as a Byte. bit to the end, where bit is in the range. Bitsīits are addressed by using the Bit DataType (X) and appending. To get 2 consecutive, non-overlapping words you need to address IW0 and IW2. It is important to note that offsets are absolute. Timer at offset 0 (No DataType is specified for Timers)Ĭounter at offset 0 (No DataType is specified for Counters) Tag addresses are made up of three different components: Area, DataType, and Offset.Ī String of length 50 starting at offset 24 in the Inputs areaīit 3 of the Byte at Offset 20 in the Inputs area
SIEMENS STEP 7 WRITE TO STRING PLUS
You need a device name plus a tag address to create a tag. The device name is a known, but the tag address needs to be configured. Once you have both the device name and tag address you enter them in the in the OPC Item Path field of the Tag Editor window using the address format, where device_name is the name of the device and address is the configured tag address which is described here. Now you can see the Temp tag in the Tag Browser. The Configuring Siemens Addressing section below, explains how your can construct these addresses. In the Tag Editor window, as an example, you can set the following values: Name: Tag Data Type: Int4 OPC Server: choose Ignition OPC-UA Server from the dropdown OPC Item Path: IW0, the S71200 device name goes in the square brackets then you give the address to PLC which in this example is IW0 ( Word at Offset 0 in the Inputs area).From the Designer, in the Tag Browser, right-click on Tags folder, and then go to New Tag > OPC Tag.This can be done either manually, as needed, or by importing bulk using the Tags CSV import functionality.
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Therefore, you must configure all tags in the Designer. The S7 protocol does not support tag browsing.