From, INSTD – Signal connection or input

Block SymbolsLicensing group: STANDARD
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Function Description
The two blocks From (signal connection) and INSTD (standard input) share the same symbol. They are used for referring to another signal, either internal or external.

In the function block library, you can only find the From block. It is converted to the INSTD block at compile time if necessary. The following rules define how the RexComp compiler distinguishes between the two block types:

In the case of INSTD block, the GotoTag parameter includes the symbol of the driver <DRV> and the name of the signal <signal> of the given driver:

E.g. the first digital input of a Modbus I/O device might be referenced by MBM__DI1. Detailed information about signal naming can be found in the user manual of the corresponding I/O driver.

Since version 2.50.5 it is possible to use placeholders in names of I/O driver signals. This is useful inside subsystems where this placeholder is replaced by the value of subsystem parameter. E.g. the flag MBM__DI<id> will refer to digital input 1, 2, 3 etc. depending on the parameter id of the subsystem the block is contained in. See the SubSystem function block for information on defining subsystem parameters.

Output

value

Signal coming from I/O driver or Goto block. The type of output is determined by the type of the signal which is being referred by the GotoTag parameter.

unknown

Parameter

GotoTag

Reference to a Goto block with the same GotoTag parameter, which should be connected with the From block or a reference to input signal of the REX I/O driver, which should provide data through the block’s output.

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