Allen-Bradley FLEX I/O 1794-IJ2, Руководство пользователя, Страница: 62 / 80

Publication 1794-6.5.11 - November 1997
5-12 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word 7
cont.
Bits 08-11
(10-13)
Minimum Frequency Sampling Time (channel 1) – Specifies the minimum time (in ms) the module will spend collecting
pulses to determine the Frequency.
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 to 1111 not used – 2ms default sample time used
Bit 12 (14)
Invert Select – Frequency Input (channel 1) – Selects whether to invert the Frequency input signal, if not using an Active High
(24V = On) 24 Vdc IEC 1+ sensor or “Normally Open” relay or switch contact on the 24 Vdc Frequency Input terminal. Allows
compatibility with an Active Low (0V = On) 24 Vdc IEC 1+ sensor or “Normally Closed” relay contact on the 24 Vdc 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 1) – Selects whether to invert the Gate input signal, if not using an Active High (24V = On)
24 Vdc IEC 1+ sensor or “Normally Open” relay or switch contact on the 24 Vdc Gate Input terminal. Allows compatibility with
an Active Low (0V = On) 24 Vdc IEC 1+ sensor or “Normally Closed” relay contact on the 24 Vdc 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 1) – Selects whether to turn On or Off the 24 Vdc Frequency input IEC 1+
hardware Wire Off (Lead Breakage) detection. 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.
0 = Disable,
1 = Enable
Default : = 0 – Disable
Bit 15 (17)
Wire Off Fault Select – Gate Input (channel 1) – Selects whether to turn On or Off the 24 Vdc Gate input IEC 1+ hardware Wire
Off (Lead Breakage) detection. 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.
0 = Disable,
1 = Enable
Default = 0 – Disable
Word 8
Bits 00-15
(00-17)
Reserved
Word Bit Definition