Execution Order
A block (line of G-code) consists of a sequence of words. The programmed order of words is not considered by the GST interpreter. Instead, the following execution order is obeyed that consists of 7 sequential and dependent steps.
1. Reference System
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| Set block number.
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| Selection of absolute/ incremental programming.
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| Selection of a tool and its orientation.
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2. Configuration
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| (De-)activation of Tool Radius Compensation.
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| Selection and programming of zero offset shift.
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| Set velocity.
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3.
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| M-functions that are configured as “before”.
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4. Parameter to PLC
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5. Movement
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| Movement to a point.
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6. Wait
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7.
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| M-functions that are configured as “after”.
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The first step sets up the reference system. The second step configures following movements. Note that the second step may depend on the first one. E.g. the programmed velocity (F) considers a velocity unit (G700) that is programmed in the same block. Step three and the following steps perform actions like a movement.