Tyco MX4428 - Manual (Page 121)

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 50Ω
N/O 100
Ω 200Ω 10Ω
MIM800
CIM800
N/C 200 Ω 50Ω
N/O Not used 200
Ω 50Ω
N/O 100
Ω 200Ω 10Ω
MIM801
N/C 200
Ω 50Ω
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 Alarm
Short
P1<=reading 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 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.