Hazard Monitoring Modbus Equipment State Interface
Overview
The Equipment State Interface will give the PLC access to the general status of each piece of
equipment attached to the system. This can be used to simply display information on control
screens or to close gates and shutdown equipment. Each piece of equipment can be in one of five
states- not in use, normal / ok, bypassed, warning, and forced shutdown.
Equipment States
Remarks
Value
Not in Use
Hazard monitoring is not enabled.
0
Normal / OK
Functioning normally.
1
Bypassed
Equipment has been bypassed. All conditions will
be reported normal.
2
Warning
Equipment is in a warning condition.
3
Forced Shutdown
Equipment is in a forced shutdown condition.
4
Factory Default Settings
IP:
192.168.0.51
Port:
502
Device ID:
1 (Base 10), 0X01
(Hex)
Timeout:
500ms
Suggested Poll Rates
We suggest polling every 500 ms using a multiple register read. Polling faster than
every 100 ms can result in latency or dropped requests. Typical response times gener-
ally do not exceed 50 ms.
Accepted Functions
Read holding registers using function number 4 (standard TCP/IP Modbus format).
Equipment Number
Modbus Address
(Base 10)
Register Type
Values (Base 10)
1
0001
Word
0 = Not in Use
1 = Normal/OK
2 = Bypassed
3 = Warning
4 = Forced Shutdown
2
0002
Word
3
0003
Word
...
...
Word
...
...
Word
30
0030
Word
31
0031
Word
32
0032
Word
*All values are base 10 unless expressed in hex notation (0X00).
Equipment State Interface Register Map (16 bit unsigned integer)
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