Lighthouse Worldwide Solutions ApexR02, Руководство по эксплуатации

Страница: 49 / 84

Program with the MODBUS Protocol
248083447-1 Rev 1 6-7
Enable Alarming for a Channel
Alarm and threshold registers are independent of each other. Any one
register’s settings will not affect the others and any channel alarms may
be enabled or disabled as the user requires. For example, to enable
alarming on just the first particle channel as shown in Table 6-7, the
user would enable Bit 1 by writing the value of ’3’ to register 43010. To
disable alarming on the first channel and enable alarming on the second
channel, write a ’1’ to register 43010 and a ’3’ to register 43012. To
enable all alarms, write a ’3’ to each of the registers 43010 and 43012.
To disable alarming completely, write a ’1’ to the enabled register or
registers (43010, 43012, 43014 or 43016).
Use the Threshold registers to set the alarm threshold value. This is
described in the next section.
Threshold Setup Registers
Threshold data is stored in the input registers in the 45xxx series which
are read/write. All threshold data items are 4 bytes long and are stored
across 2 registers. Byte and word ordering is big-endian.
For particle channels, the threshold value is a 32-bit unsigned integer.
If the data value exceeds the threshold value and the alarm is enabled
for that channel, the threshold flag in the Data Status register (30007-
30008, bit 4) is set.
The Data Status flag is set if any of the channels have a threshold
exceeded state as true.
Note:
The
Apex Remote
comes standard with 2
particle channels.
The threshold registers (45xxx series) shown in Table 6-8, run in
parallel with the data registers (30xxx series). For example, data
register 30010’s corresponding threshold register would be 45010. Data
Table 6-7 Example of Alarming on Channel 2
Registers
Particle
Channel
Bit 1
Enabled
43009 - 43010 1 0
43011 - 43012 2 1