CCR961 MANUAL-GB
42
Version B2:01-07-2015
Explanations to the Profibus protocol.
Port PA and PB is receiving the information from MASTER, while port PC and PD delivers
the signals to MASTER.
Bit PA-7, Status req. can be set to 1, to enable a request of tx status or tx analog without
sending a step command at the same time.
If Bit PB-4 is set to 1, the request is for analog values. Which analog value requested is set by
means of the Bits PB 5-6-7.
Port PC and PD are shown on the previous page, both for tx status and for tx analog.
In case of tx status step indications, Warnings and Alarms are send.
In case of tx analog values for Iout, Lamp Failure, Uout or Isolation resistance can be send.
The actual analog value in question can be determinated by means of the Bits PD 4-5-6.
The analog value is given as follows:
1.
Iout, Lamp failure and Uout
Value is given only in PC:
Bit 7 6 5 4 3 2 1 0
Binary
value
128
64 32 16 8 4 2 1
Iout: Binary value / 10 = Iout (A)
Uout: Binary value / 100 = Uout (KV)
Lamp failure: Binary value = number of faulty lamps
2.
ISO value (Resistance to ground).
Profibus master is sending the following data bit to CCR:
PA: 00000010
Step 2
PB: 01110001
master, tx analog value type 3 ~ ISO value
The analog value is given in K
Ω
by means of 3 digits: 2 significant number of zero’s
Port D
Port C
Bit
no: 7 6 5
4
3
2
1
0
7
6
5
4 3 2 1 0
Value:
Analog
pointer
2048 1024 512 256 128 64 32 16 8
4
2
1
Example:
250K ~ 251:
PD: xxxx0000 PC: 11111011
260K ~ 261:
PD: xxxx0001 PC: 00000101
56K ~ 560:
PD: xxxx0010 PC: 00110000
1,7M ~ 173:
PD: xxxx0000 PC: 10101101
Profibus data examples:
Step = 2 (normal)
Profibus master will send flg. data bit to CCR:
PA: 00000010
step 2
PB: 00000001
master, Status req.
Profibus module will send flg. data bit to master:
PC: 00000010
step 2
