Emerson MCi210, Руководство пользователя

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MCi210 User Guide
33
Issue Number: 2
Safety
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This parameter displays the status of the module's Timer Unit. The following table details the status
word bits.
7 to 8
Timer Mode:
•
0 = Free Running Mode
The selected clock drives the counter. The Timer Event Flag ( Timer Unit Status Word
( S.03.002 ) b0) is set on wraparound.
• 1 = Capture Mode 1
The selected clock drives the counter. A rising edge transition on Digital Input 3 causes
the current counter value to be latched into the Timer Capture Cache
(
Timer Unit Capture Cache ( S.03.005 )) parameter and the Timer Event Flag
( Timer Unit Status Word ( S.03.002 ) b0) is set. The counter then continues incrementing
(the Timer Event Flag ( Timer Unit Status Word ( S.03.002 ) b0) is not set on wrap-around).
• 2 = Capture Mode 2
The selected clock drives the counter. A falling edge transition on Digital Input 3 causes
the current counter value to be latched into the Timer Capture Cache
(
Timer Unit Capture Cache ( S.03.005 )) parameter and the Timer Event Flag
( Timer Unit Status Word ( S.03.002 ) b0) is set. The counter then continues incrementing
(the Timer Event Flag ( Timer Unit Status Word ( S.03.002 ) b0) is not set on wrap-around).
Note: Every time the Timer Event Flag is set an event task will be scheduled if is
configured (Bit 0-2).
In Free Running Mode (Mode 0) this will only occurs when timer counter wraps around.
In capture modes (Mode 1 and 2) this will only occurs when a rising or falling edge,
respectively, is detected.
9
External Source Clock selection:
•
0 = External clock provided on digital input 1 ( Digital Input 1 State ( S.04.001 ))
• 1 = External clock provided on digital input 2 ( Digital Input 2 State ( S.04.002 ))
S.03.002 Timer Unit Status Word
Minimum 0 (Display: 000) Maximum 7 (Display: 111)
Default Units
Type 8 Bit Volatile Update Rate Immediate
Display Format Binary Decimal Places 0
Coding RO,ND,NC, BU
Bit Description