NI PXIe-5653 Digital I/O module

The alarm code can be set or reset = 0 Variable does not initiate an alarm. within a TML program. If a variable with alarm code is changed by a write = 1 Writing to variable initiates an access, which may, for example, alarm and starts cycle 1. come from a driver block, acyclic Marked by “!” processing in ZYK 1 is initiated by a central alarm evaluation function. An alarm triggers the execution of a block sequence if the configuring operator has interconnected this function with an alarm starting function block (XA).

The fault code is set if a malfunction = 0 Variable value is valid/undisturbed. is signalled from an I/O module, the module itself is defective or an = 1 Variable value is not valid. Marked overflow occurs during an arithmetic by ”#”. operation. This code can also be set or reset in a TML program. The inter– connection result also contains a fault code if at least one faulty value has been processed.

Write protect code 

The write protect code can be set or = 0 Write access to change variable value reset in a TML program. An error is possible. message is not issued if write access to a write–protected variable has = 1 Variable value is protected against been rejected. overwriting. Marked by “S”. Read access is possible.

Error message S 314 is generated = 0 Variable is in RAM if an attempt is made to write to = 1 Variable is inside system RAM, a variable in the system RAM. i.e. no write access allowed.

Allocation code 

Error message S 302 is issued and read = 0 Variable has not been allocated, access rejected if an attempt is made invalid value. to read a variable without an allocation code. The allocation code is set when the = 1 Variable has been allocated/preset. first value is written to the variable.The consistent simultaneous processing of these protective codes is stored in the central processor’s microprogram. It represents a principal difference between the AS 235 automation system and a general–purpose computer. These codes are addressed by a supplement ”:Bx” (i.e. colon, letter B and the code bit number) after the data element name (elna).

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