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Figure 4-1. P370 Programmer With All Display Segments
Lit
The display segments remain on for approximately 2.5 seconds and then
turn off. After another 2.5 seconds, network 1 is displayed with the cursor
at row 1, column 1. If the internal diagnostic tests detect an error between
the controller and the programming panel, the error code will be displayed
in the DATA area. Refer to Appendix A for an explanation of the error code.
When not actively using the P370, it should be removed from the controller
and stored in an appropriate environment.
4.3 SYSTEM CHECKOUT AND MAINTENANCE
The Disable function (see Section 6) can be used during the checkout and
maintenance of the control system.
In checking out a system, the disable function can be used to verify the
proper wiring and operation of all discrete output coils. Each output is
displayed on the P370 Programmer and then disabled. The coil can be
cycled ON-OFF-ON-OFF, etc., and proper operation of the discrete device
observed. It is recommended that the coil be enabled before the next
output is tested to prevent unwanted functions from occurring in the
control system.
During control system maintenance, a particular “real-world” device can
be removed from MICRO 84 control by disabling either all the inputs
(discrete and register) or the logic coil associated with the device. The
device can then be repaired or replaced without affecting MICRO 84
operation. When maintenance is complete, the device can be cycled by
toggling it on and off from the P370 Programmer. After a successful
checkout, the device can be put back on line by enabling the disabled logic
element.
The disabled state of a coil or discrete input is retained after the P370
Programming Panel is removed. This provides the ability to use this
capability without leaving the programmer connected permanently.
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4-3
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