Emerson MCi210 User Manual page 33

Bit
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).
7 to 8
• 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.
External Source Clock selection:
9 • 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
Minimum
Default
Type
Display Format
Coding
This parameter displays the status of the module's Timer Unit. The following table details the status
word bits.
MCi210 User Guide
Issue Number: 2
Timer Unit Status Word
0 (Display: 000)
8 Bit Volatile
Binary
RO,ND,NC, BU
Description
Maximum
Units
Update Rate
Decimal Places
7 (Display: 111)
Immediate
0
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