ProSoft Technology 5201-MNET-101S - Manual (Page 69)

IEC-101 Slave ♦ ProLinx Communication Gateway Reference
IEC 60870-5-101 v3 Slave (Firmware version 3.xx) Protocol Manual
ProSoft Technology, Inc. Page 69 of 159
August 6, 2010
Databases
The read and write areas can be placed anywhere in the gateway's database
area. Because each point is defined individually to the gateway, the data for a
specific type need not be contiguous in the gateway's database. This means that
the gateway error/status area can be passed to the controlling station using the
M_ME_NB_1 database. In the database definition for this type, establish a
M_ME_NB_1 information object for each status value to be monitored by the
controlling station and use the gateway's status database as the DB Address.
This section discusses the databases utilized by the gateway to support the IEC
60870-5-101 protocol. The user is responsible for defining the databases for their
specific application. The size of each ASDU database and definition of each
point within each data type is established in the gateway’s configuration file or by
using ProSoft Configuration Builder. Refer to the Module Configuration section
for a complete discussion of configuration options. The following table
summarizes the ASDU data types used in each of the15 individual databases.
Type ID Type Description Data Representation
1 M_SP_NA_1 Monitored Single-point Information: This data
type stores a single binary input point.
Associated time-tagged event information for
this type are M_SP_TA_1 (2) and M_SP_TB_1
(30).
Single bit value with 0=Off and 1=On.
3 M_DP_NA_1 Monitored Double-point Information: This data
type stores a dual-point binary input value
(that is, valve status). Associated time-tagged
event information for this type are
M_DP_TA_1 (4) and M_DP_TB_1 (31).
Double-bit status with 00b (0 decimal) =
indeterminate or intermediate, 01b (1
decimal) = Off, 10b (2 decimal) = On and
11b (3 decimal) = indeterminate.
5 M_ST_NA_1 Monitored Step-point Information: This data
type is used for step position of transformers
or other step position information. The value
for the position ranges from -64 to 63.
Associated time-tagged event information for
this type are M_ST_TA_1 (6) and M_ST_TB_1
(32).
Step data is stored in a single character
value with bits 0 to 6 (-64 to +63)
representing the step position and bit 7
representing the following states: 0 =
Equipment is not in transient state 1 =
Equipment in transient state
7 M_BO_NA_1 Monitored 32-Bit Bitstring Binary State
Information: This data type is used to hold and
transmit binary state data as bitstrings of 32
bits.
Bitstring data is stored as groups of 32
bits, with each bit representing the state of
an object: 0=Off and 1=On
9 M_ME_TA_1 Monitored Normalized Measured Value: This
data type is used for analog input data.
Associated time-tagged event information for
this type are M_ME_TA_1 (10) and
M_ME_TD_1 (34).
Normalized values are stored in a (16-bit)
word data area with a range of -1..+1-2 -15
11 M_ME_NB_1 Monitored Scaled Measured Value: This data
type is used for analog input data. Associated
time-tagged event information for this type are
M_ME_TB_1 (12) and M_ME_TE_1 (35).
Scaled values are stored in a (16-bit) word
data area with a range of -2 15 .. +215 -1