Specifications

Head Station STL-ETH1 (Ethernet) Ethernet
Quick Start Guide for the MELSEC STlite Series 4 - 11
● Analog input modules
The hardware of an analog input module has 16 bits of measured analog data per channel and
8
bits of control/status. However, the head station/controller with MODBUS/TCP does not have
access to the 8 control/status bits. The 16 bits of analog data per channel are grouped as words
and mapped in Intel format in the Input Process Image.
When digital input modules are also present in the node, the analog input data is always mapped
into the Input Process Image in front of the digital data.
– Two-channel analog input modules
– Four-channel analog input modules
Output Process Image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Output Y1 Output Y0
Tab. 4-9: Allocation of data for the relay output module STL-RO2
Type of module Name ID number Description
Process Image [Byte]
Input Output
Analog
input
modules
Voltage STL-AD2-V 51205046 2 inputs 0 to 10 V
40
Current STL-AD2-I 51205047 2 inputs 4 to 20 mA
Temperature STL-TI2 51205048
2 inputs for Pt100 resistance
thermometers
Tab. 4-10: Process data of two-channel analog input modules
Input Process Image
Description
Offset
Byte Destination
High Byte Low Byte
0 D1 D0 Analog input Channel 1
1 D3 D2 Analog input Channel 2
Tab. 4-11: Allocation of data for two-channel analog input modules
Type of module Name ID number Description
Process Image [Byte]
Input Output
Analog
input
modules
Voltage
STL-AD4-V1 51205049 4 inputs 0 to 10 V
80STL-AD4-V2 51205050 4 inputs –10 to 10 V
Current STL-AD4-I 51205051 4 inputs 4 to 20 mA
Tab. 4-12: Process data of four-channel analog input modules
Input Process Image
Description
Offset
Byte Destination
High Byte Low Byte
0 D1 D0 Analog input Channel 1
1 D3 D2 Analog input Channel 2
2 D5 D4 Analog input Channel 3
3 D7 D6 Analog input Channel 4
Tab. 4-13: Allocation of data for four-channel analog input modules