5 Programming HIMax System
HI 801 001 E Rev. 4.01 Page 62 of 122
4. In the user program, program a safety-related fault reaction using the statuses Channel
OK, SC, OC (if necessary others).
The user program can process the measuring in a safety-related manner.
If the value 0 for a channel is within the valid measuring range, the user program must, at a
minimum, evaluate the parameter Channel OK in addition to the process value.
To get additional options for diagnosing the external wiring and programming fault reactions
in the user program, assign global variables to Channel OK, Submodule OK, Module OK
and to further diagnostic statuses. For more information on the individual diagnostic
statuses such as short-circuits and open-circuits, refer to the module-specific manual.
Use of Safety-Related Counter Inputs
The counter reading or the rotation speed/frequency can be used as an integer value or as
a scaled floating-point value.
Perform the following steps to use the integer value:
1. Define a global variable of type UDINT.
2. When defining the global variable, enter the initial value as safe value.
3. Assign the global variable to the integer value of the input.
The global variable provides the safe value to the user program.
Perform the following steps to use the scaled floating point value:
1. Define a global variable of type REAL.
2. When defining the global variable, enter the initial value as safe value.
3. Assign the global variable to the scaled floating point value of the input.
4. Specify the scaling value of the channel by giving a REAL value.
The global variable provides the safe value to the user program.
Use of Digital Input
Perform the following steps to write a value in the user program to a digital output:
1. Define a global variable of type BOOL.
2. When defining the global variable, enter the initial value as safe value.
3. Assign the global variable to the channel value of the output.
The global variable provides the safe value to the digital output.
To get additional options for diagnosing the external wiring and programming fault reactions
in the user program, assign global variable to Channel OK and to further diagnostic
statuses. For more information on the individual diagnostic statuses such as short-circuits
and open-circuits, refer to the module-specific manual.
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