5304-MBP-PDM ProSoft Communication Interface Module Germany

Description

The 5304-MBP-PDPM instrument also has two passive alarm contact outputs (upper and lower limits) that can set alarm values arbitrarily. Some instruments also have analog signal output interfaces for easy connection to remote RTUs.
Voltage: The maximum direct input voltage is 0-800Vdc, which exceeds the Hall sensor
Output: RS485 communication interface (Modbus RTU) protocol
Working power supply: AC220, DC12V, DC24V, DC48 or other special specifications.

This function allows you to retrieve the contents of holding registers 4xxxx (Modbus 4x range) in the addressed server. The registers can store the numerical values of associated timers and counters which can be driven to external devices. The addressing allows retrieving up to 125 registers at each request; however, the specific server device may have restrictions that lower this maximum quantity. The registers are numbered form zero (40001 = zero, 40002 = one, and so on). The broadcast mode is not allowed. The example below reads registers 40108 through 40110 (three registers) from server number 11.

Response

The addressed server responds with its address and the function code, followed by the information field. The information field contains 1 byte describing the quantity of data bytes to be returned. The contents of the registers requested (DATA) are two bytes each, with the binary content right justified within each pair of characters. The first byte includes the high order bits and the second, the low order bits. Because the server interface device is normally serviced at the end of the controller’s scan, the data reflect the register content at the end of the scan. Some servers limit the quantity of register content provided each scan; thus for large register quantities, multiple transmissions are made using register content from sequential scans. In the example below, the registers 40108 to 40110 have the decimal contents 555, 0, and 100 respectively.

Query

This function retrieves the contents of the controller’s input registers from the Modbus 3x range. These locations receive their values from devices connected to the I/O structure and can only be referenced, not altered from within the controller, The addressing allows retrieving up to 125 registers at each request; however, the specific server device may have restrictions that lower this maximum quantity. The registers are numbered for zero (30001 = zero, 30002 = one, and so on). Broadcast mode is not allowed. The example below requests the contents of register 30009 in server number 11.