ATLAS TC-4000-S

Brand: ATLAS

Type:TC-4000-S

Origin: the United States

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

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In the RTU mode, data is sent in 8-bit binary characters and transmitted in a continuous stream. In the ASCII mode, each binary character is divided into two 4-bit parts (high order and low order), changed to be represented by a hexadecimal equivalent, then transmitted, with breaks of up to 1 second possible. Because of these differences, data transmission with the ASCII mode is typically slower (see Figure 6-1 below). Figure 6-1. ASCII/RTU Representation of 3 The Modbus protocol allows one master and up to 247 slaves on a common network. Each slave is assigned a fixed, unique device address in the range of 1 to 247. With the Modbus protocol, only the network master can initiate a transaction. A transaction consists of a request from the master to a slave unit and the slave’s response. The protocol and Modbus device number are set in the Program Mode and can be adjusted in the Service Mode, if required. The 505E control is programmed to function as a slave unit only. As a slave unit, the 505E will only respond to a transaction request by a master device. The 505E can directly communicate with a DCS or other Modbus supporting device on a single communications link, or through a multi-dropped network. If multidropping is used, up to 246 devices (505Es or other customer devices) can be connected to one Master device on a single network. The device number is programmed under the 505E’s communications block and can be changed in the service mode, if needed. Each message to or from a master has a defined structure called the message “frame”. A frame consists of the slave device address, a code defining the requested data, and error checking information. See Figure 6-2.

The Modbus function code tells the addressed slaves what function to perform. The following table lists the function codes supported by this control. Modbus Function Codes CODE DEFINITION REFERENCE ADDRESS 01 Read Digital Outputs 0XXXX (Raise/Lower and Enable/Disable Commands) 02 Read Digital Inputs 1XXXX (Status Indications / Alarms and Trips) 03 Read Analog Outputs 4XXXX 04 Read Analog Inputs 3XXXX (Speed, Setpt, etc) 05 Write Single Discrete Output 0XXXX (Raise/Lower and Enable/Disable Commands) 06 Write Single Register 4XXXX (Enter Setpt Directly) 08 Loopback Diagnostic Test N/A (supports sub-function 0 only) 15 Write Digital Outputs 0XXXX 16 Write Analog Outputs 4XXXX Table 6-2. Modbus Function Codes When a Modbus message is received, it is checked for any errors or invalid data. If there is invalid data in the message, an error code is sent back to the master and the control issues an alarm message. The error codes are defined in the following table. The exception error status and respective error codes can be viewed in the Service mode under PORT # SETTINGS, where # is the number of the port (1 or 2). If the control has not received a message for the configured time-out period, the control will alarm with an error message, but no message is sent to the master. This time-out is defaulted to 2 seconds and only applies to units using both monitor and control (adjustable in the Service Mode).