Function Blocks
DC Device Control Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 123
2/07
Monitored events and device states
HTable 38 shows which events are monitored in each state.
Table 38 Monitored events and device states
DEVICE STATES
MONITORED
EVENTS
READY
(Note 1)
PRE-
START
STARTING RUNNING
DISABLED
(Notes 1,2)
STOPPING
FAILED
Run Request turns ON
X
X
Run Request turns OFF
X X X
Disable (ON)
X X X X
X
Disable (OFF)
X
Feedback from Device
X X
Device (ERR) Fail ON
X
X X
X
Device (ERR) Fail OFF X
Note 3
Reset (Rising Edge)
X
Start Delay Timer
Expires (edge)
X
Feedback Timer
Expires (edge)
X X
Stop Delay Timer
Expires (edge)
X
Notes:
1. If a device fails while in the state of READY or DISABLE, the device failure is not recognized until the
control goes into the PRESTART state.
2. There are restrictions when the control goes into the Disable state from the Running State. The device is
immediately turned OFF without a Stop Delay. When the disable turns OFF, the control changes to the
Ready state.
3. ERR Off (device fail) is monitored in Failed state, only if:
a)
Failed input caused the failure, and
b)
Auto Reset is enabled.
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