Micromod MOD: MODBUS RTU Communications Guide Manual de usuario descargar pdf (Pagina 25)

MODBUS RTU

COMMUNICATIONS GUIDE

Table 12. MODBUS Reference Information for MOD30 ML and Modcell Communications

Code Function Action Data Types Max Points per

Command

Address

Range

From To

01 Read Coil Status Read one or more

consecutive points

Discrete 99 00001-00499 CL DRWIN1-5

02 Read Input Status Read one or more

consecutive points

Discrete 99 10001-10499 CL DROIN1-5

03 Read Holding

Registers

Read one or more

consecutive registers

All except ASCII and HEX -

One Register per Point

32 40001-40499 ML SRWIN1-5

Any - Uses as many

Registers as req'd for Data

125 41001-45999 CL MRWIN1-5

04 Read Input

Registers

Read one or more

consecutive registers

All except ASCII and HEX -

One Register per Point

32 30001-30499 ML SROIN1-5

Any - Uses as many

Registers as req'd for Data

125 31001-35999 CL MROIN1-5

05 Force Single Coil Write one point Discrete 1 00001-00499 CL DRWIN1-5

06 Preset Single

Write one register All except ASCII and HEX -

One Register per Point

1 40001-40499 ML SRWIN1-5

Any - Uses as many

Registers as req'd for Data

1 41001-45999 CL MRWIN1-5

08 Loopback Test Return of Query (00) For Diagnostic Use Only N/A N/A N/A N/A

15 Force Multiple

Coils

Write one or more

consecutive points

Discrete 16 00001-00499 CL DRWIN1-5

16 Preset Multiple

Registers

Write one or more

consecutive registers

All except ASCII and HEX -

One Register per Point

16 40001-40499 ML SRWIN1-5

Any - Uses as many

Registers as req'd for Data

16 41001-45999 CL MRWIN1-5

65 Extended Modbus Read and/or Write any

Data Type

Any - Data in buffer, rather

than Coils or Registers

Note 6 n/a CL FGLISTIN

NOTES:

1. Placing discrete points into Holding or Input Registers uses an entire 16 bit register for one point. This

may be more efficient when only a small amount of discrete data is required, along with analog data. If a

significant number of discrete points are required, communications and memory efficiency would be

improved by placing them into the Coil or Input Status area. Another possibility would be to pack 16

discrete points into a count and store it in an Input or Holding Register. This would be dependent on the

host device's ability to accept the packed data format.

2. Date, Floating Point and mSec Time are converted to 16 bit integers when tied to an ML register.

3. It is recommended that no more than the number of points supported per command be put into each Slave

ML block. This will prevent the Master device from accessing more than the allowed number of points in a

single command. The instrument will not return any data if the maximum number of registers is exceeded

or an invalid register is included. Some HMI packages, such as Fix DMACS, allow poll records to be

broken into groups to avoid this problem.

4. When using Extended Modbus, group control loop data together in CL blocks for greatest efficiency.

5. Some peripheral equipment that is designed for Modbus communications may not support Extended

Modbus (function code 65).

6. The instrument's foreground can hold up to 2400 bytes of data. The number of points that can be handled

per command depends on the host software. Connecting the CL block to BGLISTIN may provide

increased performance with some host configurations. This is the case when using Database Caching

with PC-30 or Genesis for Windows. Without Database Caching enabled, a connection to FGLISTIN is

recommended.

7. Each Modbus List block can contain up to 99 points, and each type of connection provides inputs for five

lists. This is also true for Configured List blocks for Standard Modbus. When using Extended Modbus,

Configured List blocks may be nested, allowing more than 99 points to be connected to FGLISTIN or

BGLISTIN.

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