Baker Hughes Panametrics AquaTrans AT600, Руководство пользователя

Страница: 89 / 174

AquaTrans™ AT600 User’s manual 79
Chapter 6. Communication
Chapter 6. Communication
6.1 MODBUS
6.1.1 Introduction
The AT600 flow meter generally follows the standard MODBUS communications protocol defined by the MODBUS
APPLICATION PROTOCOL SPECIFICATION V1.1b, which is available at www.modbus.org. With this reference as a guide, an
operator can use any MODBUS master to communicate with the AT600 flow meter.
For the AT600, there are two limits of this implementation:
1. The AT600 supports only four of the standard function codes. These are read holding registers (0x03), read input
registers (0x04), write multiple registers (0x10), and read file record (0x14).
2. The AT600 needs a 15 ms gap between Modbus requests. The prime objective of the flow meter is to measure flow
and drive the output, so the Modbus server has a low priority.
6.1.2 MODBUS register map
Table 7: MODBUS register map
Register
(in hex) Register
(in decimal) Access
level
Description RO/RW Format
100 100 256 User Product short tag RW CHAR * 16
108 264 User Product long tag RW CHAR * 32
118 280 User Product message (for HART) RW CHAR * 32
128 296 User Product descriptor (for HART) RW CHAR * 16
140 140 320 User Product electronic serial number RW CHAR * 16
148 328 User Product fixture serial number RW CHAR * 16
150 336 User Product transducer1 serial number RW CHAR * 16
158 344 User Product transducer 2 serial number RW CHAR * 16
300 300 768 RO Main hardware version RO
CHAR * 8
304 772 RO Option hardware version RO
CHAR * 8
308 772 RO Main software version RO
CHAR * 8
500 500 1280 User Global unit group 1 for actual volumetric RW INT32
502 1282 User Global unit group 2 for day RW INT32
504 1284 User Global unit group 3 for dB RW INT32
506 1286 User Global unit group 4 for density RW INT32
508 1288 User Global unit group 5 for dimension RW INT32
50A 1290 User Global unit group 6 for Hz RW INT32
50C 1292 User Global unit group 7 for viscosity RW INT32
50E 1294 User Global unit group 8 for mA RW INT32
510 1296 User Global unit group 9 for mass RW INT32
512 1298 User Global unit group 10 for milli second RW INT32
514 1300 User Global unit group 11 for nano second RW INT32
516 1302 User Global unit group 12 for percent RW INT32
518 1304 User Global unit group 13 for second RW INT32
51A 1306 User Global unit group 14 for standard volumetric RW INT32
51C 1308 User Global unit group 15 for thermo RW INT32