
Document: LT0273
MX4428 MXP Engineering / Technical Manual
Device
Processing
Issue 1.5
24 March 2006
Page 9-11
These are designed for the following configurations–
Device
Mode
Contact R
EOL R
Max Wiring R
N/O Not
used 200
Ω
50
Ω
N/O
100
Ω
200
Ω
10
Ω
MIM800
CIM800
N/C 200
Ω
50
Ω
N/O Not
used 200
Ω
50
Ω
N/O
100
Ω
200
Ω
10
Ω
MIM801
N/C 200
Ω
50
Ω
Parameters for alternative contact and EOL resistors could be derived from the graphs in
Figure 9.7.
9.7.1
ALGORITHM - MIM800, CIM800
The unverified input condition is evaluated according to the following table, depending on the
mode (N/O or N/C) and the values of parameters P0, P1, and P2.
P2=0
P2 not = 0
N/O
N/C
P2<=reading<=255
Short
circuit
fault
P0<=reading<=255 P0<=reading<P2
Alarm
Short
P1<=reading<P0 P1<=reading<P0 Normal
Normal
0<=Reading < P1
0<=Reading < P1
Open circuit fault
Alarm
Changes in these states are verified as described in section 9.22.
For the CIM800, if either input is in fault, the point will be in fault. If either input is in alarm,
the point will be in alarm. It may therefore be in fault and alarm at the same time.
9.7.2
ALGORITHM - MIM801
The unverified input condition is evaluated according to the following table, depending on the
mode (N/O or N/C) and the values of parameters P0, P1, and P2
P5=0
P5 not = 0
N/O
N/C
P4<=reading<=255 P4<=reading<=255 Open
circuit
fault
Alarm
P3<=reading<P4 P3<=reading<P4 Normal
Normal
0<=Reading < P3
P5<=Reading < P3
Alarm
0<=Reading < P5
Short circuit fault
Short circuit fault
Changes in these states are verified as described in section 9.22.