4.5.3 Error output
The NextMove ST control card has an internal error output connected directly to the enable inputs of the ST L297 stepper controllers (see section 4.3.1). The error output must therefore be used to enable the axes. There are a number of methods for controlling the error output.
4.5.3.1RELAY keyword
Because the NextMove ST control card is used in products that include a hardware relay, the error output may be controlled directly by the RELAY keyword. The command RELAY=1 will enable the stepper controllers; the command RELAY=0 will disable them.
4.5.3.2DRIVEENABLEOUTPUT keyword
The DRIVEENABLEOUTPUT keyword can be used to configure the error output as the drive enable output. For example, the command DRIVEENABLEOUTPUT.1=_RELAY0 will mean that the error output will be the drive enable output for axis 1. When axis 1 is enabled, the error output will be activated and the axis enabled. If multiple axes are configured to use the error output as their drive enable output, enabling one axis will enable all of them. Similarly, if one axis is disabled, all will be disabled.
The RELAY keyword cannot control the error output if it is configured as a drive enable output.
4.5.3.3GLOBALERROROUTPUT keyword
By default, the error output is used as the global error output. In the event of an error on any axis, the global error output will be deactivated, disabling all axes. This action overrides the state of the error output defined by other methods, such as the drive enable status or RELAY keyword. Alternatively, the GLOBALERROROUTPUT keyword can be used to configure a general purpose digital output to be the global error output.
See the MintMT help file for details of each keyword.
4.5.3.4Jumper settings
The operation of the error output is dependent on jumpers JP1, JP3, JP4 and JP5. Jumper JP1 is situated next to the POWER IN connector on the baseboard, and must be set as shown in Figure 14.
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| JP1 | Normal operation. |
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| JP1 | output. |
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Figure 14 - Error output jumper JP1
Jumpers JP3, JP4 and JP5 are situated at the edge of the NextMove ST control card, near the end of the
MN1921 |