YASKAWA CP 341, Руководство пользователя

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6.4.4 Modbus Master - Function codes
Modbus has some naming conventions:
n Modbus differentiates between bit and word access; Bits = "Coils" and Words = "Reg-
ister".
n Bit inputs are referred to as "Input-Status" and Bit outputs as "Coil-Status".
n Word inputs are referred to as "Input-Register" and Word outputs as "Holding-Reg-
ister".
The following function codes are supported by the driver:
FC Function Action in the PLC
01 Read coil status read in bits memory bits M
read in bits outputs Q
read in bits (16bit grid) timer T
read in bits (16bit grid) counter C
02 Read input status read in bits memory bits M
read in bits inputs I
03 Read holding registers read in words data block DB
04 Read input registers read in words data block DB
05 Force single coil write in bits memory bits M
write in bits outputs Q
06 Preset single register write in words
07 Read exception status read in bits event
08 Loop back test - -
11 Fetch communication event counter read status word and event counter status, event
12 Fetch communication event log read additional status status, event, mes-
sage
15 Force multiple coils write in bits (1...2040bits) memory bits M
write in bits (1...2040bits) outputs Q
16 Preset multiple registers write in words (1...127 Register) data block DB
Naming convention
Modbus Function codes
VIPA System 300S
Communication protocols
Modbus > Modbus Master - Function codes
HB130 | CP | 341-1CH01 | en | 18-40 58