Micromod MOD: MODBUS RTU Communications Guide - Manual (Page 12)

MODBUS RTU
COMUNICATIONS GUIDE
8
USING ML AND CL BLOCKS:
DIRECTING DATA WITH ML AND CL BLOCKS
CL blocks can be connected to MSC blocks, and are usually used for discrete points. A CL block is required
for multi-register “standard” MODBUS functions, such as those needed for floating point signals. If a floating
point value is placed into an ML block, it is converted to a 16-bit integer value to be sent to the host. If floating
point values are placed into a CL, they can be connected to a multi-register input of the MSC block using two
registers, or 32 bits. The data format is per ANSI / IEEE Std 754-1985 for Binary Floating-Point Arithmetic.
This is the format used by Motorola.
* NOTE: Solid connection lines represent the most commonly used connections.
Figure 2. Extended and Standard MODBUS Lists