ProSoft Technology MVI56-103M - Manual (Page 101)

MVI56-103M ♦ ControlLogix Platform Reference
IEC 60870-5-103 Master Communication Module User Manual
ProSoft Technology, Inc. Page 101 of 152
February 22, 2013
As blocks are transferred between the module and the processor, each block
contains block identification codes that define the content or function of the block
of data transferred. The block identification codes used by the module are
displayed in the following table.
Block Range Descriptions
-1 Null block
0 Null block
1 to 20 Read or write data
9901 User Constructed Command
9902 Command Control Block (Add command to Command List Queue)
9903 Event Messages from Master port
9950 Command List Error data
9970 Set PLC time using module's time
9971 Set module's time using ControlLogix time
9998 Warm Boot Request from ControlLogix (Block contains no data)
9999 Cold Boot Request from ControlLogix (Block contains no data)
Blocks -1 and 0 transfer status data from the module to the processor and they
contain no data when transferred from the processor to the module. Blocks 1 to
20 are utilized to transfer data stored or to be stored in the module's database.
These data blocks send data from module to the processor (monitored data
received from the devices on the serial network) and to send data from the
processor to the module (control data to send to the end devices). Block
identification codes 9901 to 9999 are used for special control blocks to control
the module.