Configuring Channels on the 170 AEC 920 00 Counter Module

Using the AEC Function Block

Use the AEC derived function block (DFB) to configure the 170 AEC 920 00 module in Control Expert program logic. Each counter channel requires a separate AEC DFB.

NOTE: The 170 AEC 920 00 module DFB is not part of the standard EF/DFB library. To obtain this DFB, you can download it from Schneider Electric Technical Support at http://eclipse.modicon.com.

Each AEC DFB transmits many set values, one after another, which are then stored in the data structure par_arr, and returns the current values of the counters. The data transfer of bytes, words, and double words is started using a 0 -> 1 edge at the send input. All bits are sent in each scan cycle.

NOTE: If you include a 170 AEC 920 00 module in your configuration, the module configuration is written to and stored in the first 2 words of %MW memory (%MW1 and %MW2). You may need to reassign the memory locations of variables in your application program to avoid memory conflicts.

AEC DFB Structure

Inputs

Each AEC DFB presents the following outputs:

Parameters	Data Type	Meaning
Start3x	Word Arr 9	1. Address of the 8 input words
Start4xi	Word Arr 9	1. Address of the 8 output words
Counter	Byte	Select counter 1 or 2
send	BOOL	0-1 Edge for the data transfer of byte, word, double word (BOOL values are sent in a cyclic manner)
E_P	BOOL	Enable acceptance of preset value
E_C	BOOL	Software Enable for counter
E_CP	BOOL	Software Enable to freeze counter value
EI_F	BOOL	Enable input filter
Q1_3_F	BOOL	Activate forcing of digital outputs Q1/3
Q1_3	BOOL	Record Valence of digital outputs Q1/3;
Q2_4_F	BOOL	Activate forcing of digital outputs Q2/4;
Q2_4	BOOL	Record Valence of digital outputs Q2/4;
Mode	Byte	4 bits for the choice of operation mode
Pres_Mod	Byte	3 bits for the choice of preset mode
D_B	BOOL	Invert counting direction; effective in all operating modes
O_config	Byte	Configure outputs Q1/2 or Q3/4
L_ED	BOOL	Monitoring of the counter inputs A, B, Z for a line break.
CLOA	BOOL	Behavior of Q1 to Q4 during bus interruption
first_bl	INT	Number of the first data block to be sent
tot_blk	INT	Total number of data blocks to be sent
par_arr	Word Arr 31	Data structure with 31 word data block: 1. word: Reference number 2. word: Set point value (High word) 3. word: Set point value (low word)

NOTE: The data structure par_arr is comprised of 10 blocks.. Each data block has 3 words, the reference number, the setpoint value (low word), and the setpoint value (high word).

Outputs

Each AEC DFB presents the following outputs:

Parameters	Data Type	Meaning
Start4x	Word Arr 9	1. Address of the 8 output words
status	Byte	High-byte of 1st or 2nd input word (Status bits)
error	Byte	Low-byte of 1st or 2nd input word (detected error bits)
SratioNo	Byte	Reference number returned (if detected error = 1 F hex)
Q_1_3	BOOL	Valence of output Q1 or Q3
Q_2_4	BOOL	Valence of output Q2 or Q4
REF	BOOL	Preset value has been accepted
ECPP	BOOL	Freeze HW and SW counter values
ECP	BOOL	Counter has been enabled
PP	BOOL	Accept preset HW and SW values
RCVA	BOOL	1. Count cycle is complete
ACT_VAL	DINT	Current value or capture value
p_error	BOOL	Detected transmission error (wrong value)
ready	BOOL	Data transfer display: 0 = Transmission is active 1 = Transmission is complete