Instruction Manual

The user may select an alarm deadband of 0 to 9 % of the setpoint. Refer to the

command summary at the end of this section for further information.

Entering a deviation percentage of 0% (which is the default value) will result in no

deadband and alarms will be set and cleared as measured temperatures cross the

alarm setpoints.

NOTE:

Entering a new deviation percentage will result in the 8 upper and 8

lower deadband limits being recalculated instantly. Entering a new alarm

setpoint (high or low) for any loop will result in the deadband limit for that

alarm setting being recalculated at that time.

1.1.3 GLOBAL ALARMS

Two global alarms are provided in Automatic Alarm Mode: one for high alarms and

one for low alarms.

The alarm output AL1 on the PID is set if any one of the 8 Expander Card High

Alarm Outputs is on. It is cleared when no High Alarm Outputs are Set on the

Expander Card.

The alarm output AL2 on the PID is set if any one of the 8 Expander Card Low

Alarm Outputs is on. It is cleared when no Low Alarm Outputs are Set on the

Expander Card.

1.2 I/O CONTROL MODE

In I/O control mode lines 0 to 15 are under user control and may be defined as inputs or

outputs and written or read accordingly.

Refer to the command summary at the end of this section for further information

regarding commands to set, clear and interrogate the status of I/O lines.