ProSoft Technology MVI56-104S - Manual (Page 66)

MVI56-104S ♦ ControlLogix Platform Ladder Logic
IEC 60870-5-104 Server Communication Module User Manual
Page 66 of 188
ProSoft Technology, Inc.
November 18, 2009
3.2.1 Read Block
This block transfers IEC output (control) data sent from the remote IEC 104
Client through the module to the ControlLogix processor. The following table
outlines the structure of data contained in the input image of a normal Read
Block.
Offset Description Length
0 Reserved 1
1 Write Block ID 1
2 to 201 Read Data 200
202 Program Scan Counter 1
203 to 204 Product Code 2
205 to 206 Product Version 2
207 to 208 Operating System 2
209 to 210 Run Number 2
211 to 214 Data Transfer Status 4
215 t0 Error Count 1
216 t1 Error Count 1
217 t2 Error Count 1
218 t3 Error Count 1
219 Sequence # Error Count 1
220 Bad Address Error Count 1
221 Length Error Count 1
222 Receive Frame Count 1
223 Transmit Frame Count 1
224 Socket State 1
225 Socket Open Count 1
226 Socket Close Count 1
227 Socket Connection Count 1
228 Free events in event buffer for M_SP_NA points 1
229 Free events in event buffer for M_DP_NA points 1
230 Free events in event buffer for M_ST_NA points 1
231 Free events in event buffer for M_ME_NA points 1
232 Free events in event buffer for M_ME_NB points 1
233 Free events in event buffer for M_ME_NC points 1
234 Free events in event buffer for M_IT_NA points 1
235 to 248 Spare 14
249 Read Block ID 1
The Read Block ID is an index value sent by the module and used by the ladder
logic to determine where the current 200-word block of input data should be
placed in the ControlLogix processor IEC870S.ReadData controller tag array.
Each input data block transfer can move up to 200 words of user application data
(Read Block offsets 2 to 201) from the module to the processor. In addition to
moving user data, the block also contains module status data. This status data is
transferred with each new input image block and can be used for module
diagnostics.