Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual User Manual
Page 54
Publication 1794-6.5.11 - September 2011
44 Read and Write Configuration Maps for the FLEX I/O Module
Word 3
Bit 07
Minimum Frequency Sampling Time (channel 0) – Specifies the minimum time (in ms)
the module spends collecting pulses to determine the Frequency.
Bits 08…11
(10…13)
Bit
11
(13)
10
(12)
09
(11)
08
(10)
Minimum Frequency Sampling Time (in ms)
0
0
0
0
2
0
0
0
1
4
0
0
1
0
5
0
0
1
1
10
0
1
0
0
20
0
1
0
1
50
0
1
1
0
100
0
1
1
1
200
1
0
0
0
500
1
0
0
1
1000
1010…1111 not used – 2 ms default sample time used
Bit 12 (14)
Invert Select – Frequency Input (channel 0) – Selects whether to invert the Frequency
input signal, if not using an Active High (24V = On) 24V DC IEC 1+ sensor or Normally
Open relay or switch contact on the 24V DC Frequency Input terminal. Allows
compatibility with an Active Low (0V = On) 24V DC IEC 1+ sensor or Normally Closed
relay contact on the 24V DC Frequency Input terminal.
0 = Normal (Active High, 24V = On),
1 = Invert input (Active Low, 0V = On).
Default = 0 – Normal (Active High, 24V = On)
Bit 13 (15)
Invert Select – Gate Input (channel 0) – Selects whether to invert the Gate input signal,
if not using an Active High (24V = On) 24V DC IEC 1+ sensor or Normally Open relay or
switch contact on the 24V DC Gate Input terminal. Allows compatibility with an Active
Low (0V = On) 24V DC IEC 1+ sensor or Normally Closed relay contact on the 24V DC
Gate Input terminal.
0 = Normal (Active High, 24V = On),
1 = Invert input (Active Low, 0V = On)
Default = 0 – Normal (Active High, 24V = On)
Bit 14 (16)
Wire Off Fault Select – Frequency Input (channel 0) – Selects whether to turn On or Off
the 24V DC Frequency input IEC 1+ hardware Wire Off (Lead Breakage) detection.
0 = Disable,
1 = Enable
Default: = 0 – Disable
Note: Customer devices must draw more than 0.4 mA in the On and Off State. To use
this feature with relays or switches, connect a shunt resistor (~ 50K) across the
contacts.
Bit 15 (17)
Wire Off Fault Select – Gate Input (channel 0) – Selects whether to turn On or Off the
24V DC Gate input IEC 1+ hardware Wire Off (Lead Breakage) detection.
0 = Disable,
1 = Enable
Default = 0 – Disable
Note: Customer devices must draw more than.4 mA in the On and Off State. To use this
feature with relays or switches, connect a shunt resistor (~ 50K) across the contacts.
Bit/Word Definitions for the Block Transfer Write Words
Word
Bit
Definition