35
SafeGuard Controller User Manual
MAN-0115 Rev 0
24 Hour Trend Database:
The 24 hour MAX, MIN and AVERAGE trend data may be retrieved over the Modbus serial interface.
Each channel consists of 240 MAX, MIN and AVERAGE values, or, one value for every 1/10 hour (6
minutes). Since there are 16 channels this database equals 3,840 registers in addresses 33017-36857. Due
to the large size, MAX, MIN or AVERAGE values may only be retrieved one at a time. To improve
bandwidth the master may retrieve the database in blocks of 120 registers at a time (one half of a channel’s
data). The C1 only updates these 3,840 registers upon receiving an update command from the Modbus
master.
Type
Channel
First
Last
Read FC
Write FC Notes
Update MIN
n/a
2065
n/a
n/a
5
Moves 24 hour MIN data trend to trend data base
Update AVG.
n/a
2066
n/a
n/a
5
Moves 24 hour MIN data trend to trend data base
Update MAX
n/a
2067
n/a
n/a
5
Moves 24 hour AVG data trend to trend data base
This update requires several seconds. Therefore, a data ready register is available to notify the master upon
completion.
Type
Channel
First
Last
Read FC
Write FC Notes
MIN Ready
n/a
12065
n/a
2
n/a
0 = data ready; 1 = update in progress
AVG. Ready
n/a
12066
n/a
2
n/a
0 = data ready; 1 = update in progress
MAX Ready
n/a
12067
n/a
2
n/a
0 = data ready; 1 = update in progress
Trend database registers
Type
Channel
First
Last
Read FC
Write FC Notes
24 hr Trend
1-16
33017
36857
5
n/a
Transfers 24 hour trend for MAX, MIN or AVG.
