ProSoft Technology MVI56-101S - Manual (Page 110)

Reference MVI56-101S ♦ ControlLogix Platform
User Manual IEC 60870-5-101 Slave Communication Module
Page 110 of 193 ProSoft Technology, Inc.
August 2, 2011
Type ID Type Description Data Representation
13 M_ME_NC_1 Monitored Measured Value, Short Floating-
Point Number: This data type is used for
analog input data stored in floating point
format according to the IEEE STD 754, QDS
format. Associated time-tagged event
information for this type are M_ME_TC_1 (14)
and M_ME_TE_1 (36). Short floating-point number stored in IEEE
STD 754 format (Fraction, Exponent, Sign)
15 M_IT_NA_1 Monitored Integrated Total-point Information:
This data type stores meter or other count
data. Associated time-tagged event
information for this type are M_IT_TA_1 (15)
and M_IT_TB_1 (37). Binary counter data is stored in a double-
word (32-bit) value with a range of -
2
31 ..+2 31 -1.
45 C_SC_NA_1 Single-point Command: This command
controls a single binary point such as a relay. Single bit value with 0 = Off and 1 = On
46 C_DC_NA_1 Double-point Command: This command
controls a dual-point binary control device
such as a trip/close relay. Double Command with 0 = Not permitted 1
= Off 2 = On 3 = Not permitted
47 C_RC_NA_1 Regulating Step Command: This command
controls a stepping device such as a
transformer. Regulating Step Command with 0 = Not
permitted 1 = Next step lower 2 = Next
step higher 3 = Not permitted
48 C_SE_NA_1 Setpoint Command, Normalized Value: This
command controls an analog device. Normalized values are stored in a (16-bit)
word data area with a range of -1..+1-2
-15
49 C_SE_NB_1 Setpoint Command, Scaled Value: This
command controls an analog device. Scaled values are stored in a (16-bit) word
data area with a range of -2
15 .. +215 -1
50 C_SE_NC_1 Setpoint Command, Short Floating-Point
Value: This data type is used for analog input
data stored in floating point format according
to the IEEE STD 754, QDS format. Short floating-point number stored in IEEE
STD 754 format (Fraction, Exponent, Sign)
51 C_BO_NA_1 32-Bit Bitstring Binary State Command: 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
A key concept in interfacing the protocol with the internal database is the
relationship between the IEC-60870-5-101 databases and the data transfer
operation between the driver and module's internal database. The control data
types, C_XX_XX_1, are transferred from the driver to the module's internal
database. This data can then be used by the other gateway protocol or processor
in which the module is installed to control other devices. The monitor data types
(M_XX_XX_1) are sourced from the module's internal database and is
transferred to the remote Master on the IEC-60870-5-101 network.