AVEVA™ Plant SCADA

Allen-Bradley PLC-5/250 via TCP/IP - Data Types

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Allen-Bradley PLC-5/250 via TCP/IP - Data Types

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Last UpdatedAug 01, 2025
3 minute read

Note: The Allen-Bradley PLC-5/250 has many data types. The driver makes a separate request for each different data type, and each request has a finite overhead. It is more efficient to read fewer data types, so you should move the I/O and other data into a few main blocks to be read by Plant SCADA.

Data Types	Address Format	Plant SCADA Data Type
Output image	O:O/o	DIGITAL
Input image	I:O/o	DIGITAL
Status words 0 to 350	S:w/b	DIGITAL
Internal storage	IS:w/b	DIGITAL
Status words 0 to 31	nS:w/b	DIGITAL
Timer	nTf:w.t	DIGITAL
Timer	nTf:w/b	DIGITAL
Counter	nCf:w.c	DIGITAL
Counter	nCf:w/b	DIGITAL
Control	nRf:w.r	DIGITAL
Control	nRf:w/b	DIGITAL
Binary	nBf:w/b	DIGITAL
Integer	nNf:w/b	DIGITAL
Floating Point	nFf:w/b	DIGITAL
Long	nLf:w/b	DIGITAL
PID	nPDf:w.p	DIGITAL
Block transfer data	nBTDf:w/b	DIGITAL
Output image	O:O	BCD / INT
Input image	I:O	BCD / INT
Status words 0 to 350	S:w	BCD / INT
Internal storage	IS:w	BCD / INT
Status words 0 to 31	nS:w	BCD / INT
Counter	nCf:w.T	BCD / INT
Control	nRf:w.C	BCD / INT
Binary	nBf:w	BCD / INT
Integer	nNf:w	BCD / INT
Block transfer data	nBTDf:w	BCD / INT
Shared data words 0-1023	nSDf:w	BCD / INT
Timer	nTf:w.T	LONG / LONGBCD
Long	nLf:w	LONG / LONGBCD
Floating Point	nFf:w	REAL
PID	nPDf:w.P	REAL
String 82 bytes long	nSTf:w	STRING

Where:

n	Optional Module Number 0 to 8 decimal
f	File Number 0 to 9999 decimal
:w	Element Number 0 to 9999 decimal
:O	Element Number 0 to 777 octal
/b	Bit Number 0 to 15 decimal
/o	Bit Number 0 to 17 octal
.T	Timer/Counter Sub Element PRE = Preset Value ACC = Accumulated Value
.C	Control Sub Element LEN = Length POS = Position
.P	PID Sub Element SP = Set Point KP = Proportional Gain KI = Integral Gain KD = Derivative Gain BIAS = Output Bias % MAXS = Maximum Scaled Value MINS = Minimum Scaled Value DB = Deadband SO = Set Output % MAXO = Maximum Output % MINO = Minimum Input % UPD = Update Time PVH = PV Alarm High PVL = PV Alarm Low PVDB = PV Alarm Deadband PV = Process Variable ERR = Error OUT = Output DVP = Deviation Alarm + DVN = Deviation Alarm - DVDB = Deviation Alarm Deadband MAXI = Maximum Input MINI = Minimum Input TIE = Tieback %
.t	Timer bits EN = Enable TT = Timing DN = Done BS LK
.c	Counter bits CU = Count Up CD = Count Down DN = Done OV = Overflow UN = Underflow LK
.r	Control bits EN = Enable EU = Enable Unloading DN = Done EM = Empty ER = Error UL = Unload IN = Inhibit Comparisons FD = Found
.p	PID bits EN = Enable CT = Cascaded Type CL = Cascaded Loop PVT = PV Tracking DO = Derivative Of SWM = Software A/M Mode CA = Control Action MO = Mode PE = PID Equation INI = PID Initialized SPOR = SP Out of Range OLL = Output Limit Low OLH = Output Limit High EWD = Error Within Deadband DVPA = Deviation Low Alarm DVNA = Deviation High Alarm PVLA = PV Low Alarm PVHA = PV High Alarm

Examples

Data Type	DIGITAL
Address	I:1/15
Comment	Input Image - Element Number 1 / Bit Number 15

Data Type	INT
Address	N7:3
Comment	Input Image - Element Number 1 / Bit Number 15

Allen Bradley 5/250 PLCs support remapping reads and writes.

AVEVA™ Plant SCADA

Allen-Bradley PLC-5/250 via TCP/IP - Data Types

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Allen-Bradley PLC-5/250 via TCP/IP - Data Types

Examples

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