Reading Diagnostic Signals of Safety-related Modules
The standard application (Logic/Motion Controller) and the safety-related application can directly communicate.
Beside the Safety Logic Controller exchange variables (see section Exchanging Data between Logic/Motion Controller and Safety Logic Controller), also the TM5/TM7 I/O modules provide diagnostic exchange signals.
After you have inserted a safety-related I/O module into your bus architecture (Devices tree in Logic Builder), and then confirmed the modified bus configuration in Machine Expert - Safety, these diagnostic signals are available in the Devices window.
NOTE: These signals are diagnostic signals for evaluation purposes in the standard application. They have no impact on the safety function. Diagnostic exchange signals always have a standard data type.
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UNINTENDED EQUIPMENT OPERATION |
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oVerify that the relevant diagnostic process data items provided by the Safety Logic Controller and the I/O modules involved in your safety-related application are monitored and evaluated so that your standard application can determine the state of the functional safety-related system. oValidate that the machine is set to the application-specific defined safe state (according to your risk analysis) depending on the safety-related diagnostic process data evaluation. oUse appropriate safety interlocks where personnel and/or equipment hazards exist. oValidate the overall safety-related function and thoroughly test the application. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
Reading the Physical State of a Safety-related Output Channel
This chapter describes the use of a diagnostic signal of a safety-related TM5/TM7 I/O module based on an application example: A safety-related TM5 output module provides one diagnostic signal per channel which mirrors the physical state of the safety-related output. These signals can be read in the standard Logic/Motion Controller application.
The following procedure describes how to map this signal in the standard application thus enabling the Logic/Motion Controller to react on the physical state of the safety-related output channel.
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1 |
In the Devices tree, double-click the safety-related output module of which you want to read the output channel status. |
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Open the TM5 Module I/O Mapping editor. |
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In the signal table, locate the signal PhysicalStateChannelxx, where xx is the channel number. This signal is in the Status signal group. |
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Map a variable. You have two possibilities: oEnter a variable name into the Variable table cell. This way, a new global variable is declared if the entered name is not yet declared. oOr double-click the … icon to select an existing variable from the Input Assistant. |
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Program a read access to the mapped variable in your application code (flag evaluation) and evaluate the variable in a way that the standard application can react on an undesired or unintended output channel status. |
