Signal Lines - Honeywell BR3C9 Operation Manual

TABLE 3-2. SIGNAL LINES
Line Function
Command Code
DCO-5
Device Command
Strobe (DCS)
Operational Out
(OPO)
Device Initialize
(DIN)
Data Modifier
(CMl)
Serial Write Out
(SWO)
Device Event
Notification (DEN)
Fault
Serial Read In
(SRI)
83318200 A
Lines From Controller To Drive
Six lines plus parity which carry encoded commands from
controller to drive.
Indicates that the Command Decode lines are valid and the
command may
be
decoded .•
When true it indicates the controller is operational.
Unless this line is true the drive will ignore all sig-
nals from the controller.
Acts as
a
general reset to the drive: All drive status
and control functions are reset and the positioner re-
turns to cylinder 000. Before the drive will react to
this signal the following conditions must be met.
• Controller issuing command must have Operational
Out true.
• Controller issuing command must have seized the
drive. This signal releases the seized status.
• Drive must be On Line
Used during a write operation it causes the· drive to
ignore the data on the bidirectional data lines thereby
creating an address mark.
Signal from Controller to drive that is used in conjunc-
tion with Serial Write In (SRI) to syncronize transfer
of data on the bidirectional data lines.
Lines From Drive To Controller
This line indicates that an event has occurred which
is reflected in the Summary Status byte. The controller
obtains this byte via Summary Status Request (Tag 28).
Indicates the drive has detected an error. The con-
troller can determine the specific error by examining
the Detailed Status bytes via the Detailed Status Re-
quest Commands
(~ags
29 through 30). All fault con-
ditions, except pack unsafe, are cleared when the
Detailed Status byte identifying the fault is requested
or by a Device Initialize signal. Pack unsafe must be
cleared by pushing the CHECK switch/indicator on the
maintenance panel. The pack unsafe signal is caused by
any of the following:
• Low DC Voltage
• No Servo Tracks Detected
• Write Current Fault
• Read or Write and Not On Cylinder
Signal from drive to controller that is used in conjunc-
tion with Serial Write Out to syncronize transfer of
data on the bidirectional data lines.
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