Rockwell Automation GMLC Reference Manual - Manual (Page 629)

Publication GMLC-5.2 - November 1999
592 Status Variables
In the Tag Explorer select General System Variables, then select DH-
485_status in the Tag Window.
When DH485_status = 2, the motion controller is busy doing one of the
following caused by a DH-485 Value block with either Send or Read
selected:
• Reading a value.
• Sending a value.
• Waiting for an acknowledgment or reply from a remote device on the
DH-485 network.
When DH485_status = 1, the motion controller is not communicating on
the DH-485 network. This condition is usually caused by a DH-485 fault.
When DH485_status = 0, the motion controller is communicating
properly with other devices on the DH-485 network. This is the normal
status condition.
Axis I Limit Status 1394
The Axis_i_limit_Status variable reports the status of the torque/current
limit imposed by the controller. If the torque, being commanded by the
control, is greater than the preset value of the 1394 current limit or the
dynamic It limit (see below), this status variable returns the value 1.
In the Tag Explorer, select both Axis System Variables and the desired
physical axis, then select Axis_i_limit_status in the Tag Window.
Axis It Limit Status 1394
The Axis_it_limit_Status_1394 variable reports the status of the torque/
current imposed by the it (the motor current integrated over time) limit of
the controller. If more torque is being commanded by the control,
exceeding the present value of the 1394 axis it limit, this status variable
returns a 1. The it limit value changes dynamically as the commanded
current to the axis is integrated over time. In situations demanding high
duty cycle acceleration and deceleration motion profiles, the drive it limit
can actually fall below the axis current limit setting in order to protect the
drive from an it fault condition.