ProSoft Technology MVI56-LTQ - Manual (Page 83)

MVI56-LTQ ♦ ControlLogix Platform Reference
Limitorque Valve Actuator Master Communication Module User Manual
ProSoft Technology, Inc. Page 83 of 98
August 30, 2010
Looped Network Truth Table
(Recorded in Slave Status Register Bit 10 and 11)
Example 1 Example 2 Example 3 Example 4
Slave # Ch. A Ch. B Ch. A Ch. B Ch. A Ch. B Ch. A Ch. B
1 0 0 0 0 0 1 0 1
2 0 0 0 0 0 1 0 1
3 0 0 1 1 0 1 0 1
4 0 0 0 0 1 0 0 1
5 0 0 0 0 1 0 0 1
Example 1:
The LTQ is successfully communicating to each slave and sets the bits equating
to Channel A and B to 0. A value of 0 in the Channel A and B status indicate
successful communication.
Example 2:
The LTQ is successfully communicating to slaves 1, 2, 4, and 5 via both ports.
Slave number 3 is without power causing the slave 3 network board bypass
relays to de-energize. This de-energizing of the bypass relays shorts the signal
through the network board and isolates the slave from the DDC-100 network.
Example 3:
The LTQ is successfully communicating to slaves 1, 2, 3 via port 1 and 4, 5 via
port 2. When a slave does not communicate within a predetermined time-out
period the LTQ sets the corresponding Channel bit to a value of 1. This example
indicates a wiring problem between slave 3 & 4. This problem is typically a cable
breakage, short, or improperly terminated wire.
Example 4:
The LTQ is attempting to communicate to the slaves via both ports but is unable
to reach any slaves via port 2. This typically indicates a broken cable connection
at port 2 or at the first slave from port 2, broken or shorted cable between the
LTQ and the first slave from port 2, improperly terminated wires, or loss of power
to the RS-232/485 converter if attached to the LTQ port 2.
Non-Looped Network Truth Table via Port 1 Polling Only
(Recorded in Slave Status Register Bit 10, Bit 11 Channel B is always 0)
Example 5 Example 6 Example 7
Slave # Ch. A Ch. B Ch. A Ch. B Ch. A Ch. B
1 0 0 0 0 0 0
2 0 0 1 0 0 0
3 0 0 0 0 1 0
4 0 0 0 0 1 0
5 0 0 0 0 1 0