Automationdirect.com DL06 - Page 146

DL06 Micro PLC User Manual; 3rd Edition Rev. E
4–13
Chapter 4: System Design and Configuration
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If Your Host Software Requires the Data Type and Address
Many host software packages allow you to specify the MODBUS data type and the MODBUS
address that corresponds to the PLC memory location. This is the easiest method, but not all
packages allow you to do it this way.
The actual equation used to calculate the address depends on the type of PLC data you are
using. The PLC memory types are split into two categories for this purpose.
• Discrete – X, SP, Y, CR, S, T, C (contacts)
• Word – V, Timer current value, Counter current value
In either case, you basically convert the PLC octal address to decimal and add the appropriate
MODBUS address (if required). The table below shows the exact equation used for each group
of data.
DL06 Memory Type
QTY
(Decimal)
PLC Range
(Octal)
MODBUS Address
Range
(Decimal)
MODBUS Data Type
For Discrete Data Types .... Convert PLC Addr. to Dec. + Start of Range + Data Type
Inputs (X)
512 X0 – X777 2048 – 2559 Input
Special Relays(SP)
512 SP0 – SP777 3072 – 3583 Input
Outputs (Y)
512 Y0 – Y777 2048 – 2559 Coil
Control Relays (CR)
1024 C0 – C1777 3072 – 4095 Coil
Timer Contacts (T)
256 T0 – T377 6144 – 6399 Coil
Counter Contacts (CT)
128 CT0 – CT177 6400 – 6527 Coil
Stage Status Bits(S)
1024 S0 – S1777 5120 – 6143 Coil
For Word Data Types .... Convert PLC Addr. to Dec. + Data Type
Timer Current Values (V)
256 V0 – V377 0 – 255 Input Register
Counter Current Values (V)
128 V1000 – V1177 512 – 639 Input Register
V-Memory, user data (V)
3200 V1200 – V7377 640 – 3839 Holding Register
4096 V10000 - V17777 4096 - 8191 Holding Register
V-Memory, non-volatile (V)
128 V7400 – V7577 3840 – 3967 Holding Register