Publication 1794-6.5.11 - November 1997
5-8
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Write
word 1
cont.
Bits 10-12
(12-14)
Number of pulses to terminate sampling (channel 0) – Lets you calculate Frequency when a specified number of input pulses
have occurred. This allows earlier reporting of the frequency than the Minimum Frequency Sampling Time, when many input
pulses are occurring. Accurate frequency determination is possible without waiting for the full Minimum Frequency Sampling
Time to expire.
Defaul
t = minimum frequency sampling time.
Bit
12
(14)
11
(13)
10
(12)
Number of pulses to terminate sampling
0
0
0
Use minimum frequency sampling time
0
0
1
2
0
1
0
4
0
1
1
8
1
0
0
16
1
0
1
32
1
1
0
64
1
1
1
128
Bit 13 (15)
Frequency range bits (channel 0) – Specifies the Frequency Range of the Frequency input.
0 = 1-32767 (below 1Hz reports 0);
1 = 1.0-3276.7 (below 1.0Hz reports 0.0).
Default
= 0
Bit 14 (16)
Safe state mode bit – selection determines how module alarm outputs react to bus communication and internal module faults
(local fault = Wire Off Fault or Missing Pulse Alarm).
0 = Reset outputs
1 = Hold last state
Default
= 0 (reset outputs).
Bit 15 (17)
Communication fault – Signals the module that communications has been interrupted on the network. The adapter signals
that the module should execute its fault routine or go to the Safe State and control any Alarm Outputs accordingly. During
normal startup, this bit must be set (1) by the user program to begin normal module operation of Alarm Outputs (in effect, an
output enable). When the adapter communication link is broken, the adapter will reset this bit (0).
– (Adapter dependent.)
Default
= 0.
Word 2
Bits 00-15
(00-17)
Maximum frequency or absolute value acceleration/deceleration (channel 0) – Specifies the highest Frequency or absolute
Acceleration/Deceleration value allowed on the Frequency input. 0-32,767, 0.0-3,276.7Hz.
–OR–
0-32,767Hz/s depending
on the Frequency Range and Frequency/Acceleration Alarm Select bits.
Word 3
Bits 00-07
Frequency scaling multiplier (channel 0) – Specifies a multiplier to scale the incoming Frequency value. 0-255.
Default
= 0 – no scaling multiplication performed (x1)
Bits 08-15
(10-17)
Frequency scaling divisor (channel 0) – Specifies divisor to scale the incoming Frequency value. 0-255.
Default
= 0 – no scaling division performed (divided by 1)
Word
Bit
Definition