User guide

Publication 1746-UM006B-EN-P - August 2005
4-16 Configuration and Programming
I:e.0 Status Word
I:e.0 Bits 0 and 1
Bits 0 and 1 are reserved and must be reset to 0.
I:e.0 Bit 2 - Zero Rate Period Count
The module sets this bit to 1 whenever the Rate Period Count is found
to be zero over a Rate Period.
The bit is cleared to 0:
• any time a non-zero count is obtained
• when there is a Rate Period Count overflow
• upon the 0 to 1 transition of the Function Control bit
This bit is updated after every Rate Period.
0 = No configuration error
1 = Invalid configuration data
0 = No overflow
1 = Overflow
0 = Invalid Rate
1 = Rate V alid
0 = No overflow
1 = Overflow
0 = No errors detected
1 = Error detected
0 = No error detected
1 = Overflow/Underflow
00 = Stopped
01 = Running
10 = Undefined
11 = Hold
0 = False Reset Mode
1 = T rue Reset Mode
Status Word, Word 0
Bit Number (decimal) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
I:e.0
Rate V alid
Rate Counter Overflow
Rate Measurement Overflow
Critical Error
Configuration Error
Pulse Counter State
Overflow/Underflow
Reset Input
RRRRRR
0 = Nonzero Rate Period count
1 = Rate Period Count is 0
Zero Rate Period Count
R
= Reserved, must be reset to 0
Zero Rate Period Count (bit 2) Cause
0 Non-zero count is obtained, rate period overflow, or,
counter function has been enabled
1 Rate Period Count is Zero over a Rate Period