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MVI46-N2 ♦ SLC Platform Reference
Johnson Controls N2 Communication Module
Page 48 of 68 ProSoft Technology, Inc.
October 27, 2008
Command Control Blocks
Command control blocks are special blocks used to control the module or
request special data from the module. The current version of the software
supports four command control blocks: Binary Output Write, Analog Output
Write, Warm Boot and Cold Boot.
Warm Boot
This block is sent from the SLC processor to the module when the module is
required to perform a warm-boot (software reset) operation. The structure of the
control block is shown below:
M1 Offset Description Length
6800 9998 1
Cold Boot
This block is sent from the SLC processor to the module when the module is
required to perform the cold boot (hardware reset) operation. This block is sent to
the module when a hardware problem is detected by the ladder logic that
requires a hardware reset. The structure of the control block is shown below:
M1 Offset Description Length
6800 9999 1
Pass-Through Control Blocks
The module will pass blocks with identification codes of 9001 and 9002 to the
processor for each received function 7/2/4, and 7/2/3 command respectively. The
structure of the pass-through control blocks are shown in the following tables:
Block 9001
M0 Offset Description Length
0 0 1
1 9001 1
2 Binary Point Offset 1
3 Binary Value 1
Block 9002
M0 Offset Description Length
0 0 1
1 9002 1
2 Analog Point Offset 1
3 Analog Value 2
The ladder logic should copy the received data and control the processor as
expected by the master device. The processor must respond to the pass-through
control block with the following format:
M0 Offset Description Length
0 0 1
This informs the module that the command has been processed and can be
cleared from the pass-through queue.